Autumn Equinox in Vietnam: Children Carry Lanterns, the Moon Runs the Festival, and the Rain Still Doesn’t Ask Anyone About September 23

If September in Vietnam were run by one large central office, the meetings would be a disaster. The Sun would arrive with a spreadsheet and announce that astronomical autumn begins on September 23. The Moon would barely have sat down before replying, “Lovely. Trung Thu is on the twenty-fifth this year.” Rice in the northern mountains would point out that it is turning gold, the Mekong would object that its fields have an entirely different work schedule, the central coast would look out of the window at the rain, and Hanoi would be hanging lanterns in the meantime. The monsoon would not attend the meeting. It has work to do.

That is probably one of the best ways to understand September in Vietnam. There is no single clock that switches the whole country into “autumn” at the same moment. Astronomy has the Sun; Tết Trung Thu follows a lunisolar calendar; agriculture has several rice cycles; weather has the monsoon; and regions and communities have their own ways of reading the year. Somewhere in the middle of all this, children run around with lanterns and the European calendar begins to look rather under-equipped.

Lola Tralala reports: “I brought a sweater for the first day of autumn.”
Vietnam: “That’s adorable.”

The equinox is precise. Life has other plans.

Astronomy is unusually uncomplicated here. The September equinox is a specific moment in Earth’s orbit, when the Sun in its apparent path crosses the celestial equator. Vietnam lies in the Northern Hemisphere, so this marks the beginning of astronomical autumn. In Hanoi in 2026, that moment arrives on September 23 at 7:05 a.m. local time.

At 7:04 it is therefore astronomical summer; at 7:05, astronomical autumn. If you expect the first yellow leaf to fall from a palm tree at 7:06 and somebody to arrive with a pumpkin latte, I have bad news. The equinox is an excellent astronomical reference point. It simply should not be promoted to chief executive of every season on Earth.

Vietnam is almost suspiciously good at demonstrating why. The country stretches across several climatic regimes. The monsoon influences all of them, but not in the same way. Annual temperature variation is more pronounced in the north; in much of the south, the alternation of wet and dry seasons can be more useful in everyday life than a four-season model; and the central regions receive their main rainy season later. Climate summaries commonly place the stronger monsoon rains in the north and south mainly from May to October, while central Vietnam often receives its heaviest rains from roughly September into the winter months.

So yes: astronomical autumn begins in Vietnam on September 23. But so far we have answered an astronomy question, not a question about what people, fields or clouds are doing.

The Moon refuses to respect September 23

Now comes a perfectly reasonable objection: “All right, but what about all those lanterns? Isn’t that an autumn festival?”

Yes. And also no.

Tết Trung Thu falls on the full moon of the fifteenth day of the eighth month in the Vietnamese lunisolar calendar. Its date therefore moves from year to year in the Gregorian calendar. In 2026, Rằm tháng Tám falls on September 25, a date also used by Hanoi’s official programme, which schedules a full-moon procession around Hoàn Kiếm Lake that evening. The equinox is on September 23; Trung Thu is two days later. A neat little calendar trap.

But the equinox is not what is being celebrated. Proximity in the calendar is not a family certificate. The equinox is determined by the relationship between Earth and the Sun, while Trung Thu follows another system of reckoning time.

Lola: “So the Sun has the 23rd and the Moon the 25th?”
BeadCulture: Yes.
Lola: “Did they coordinate?”
BeadCulture: No.
Lola: “Finally, a calendar I understand.”

We should be just as careful with another popular shortcut: “It is simply the Chinese Mid-Autumn Festival in Vietnamese.” Not quite. Cultural history would be suspiciously easy if that were enough.

Tết Trung Thu does belong to a wider East Asian family of festivals connected with the eighth lunar month, and the historical links between Vietnam, China and other parts of the region are very real. But relatives are not clones. Over centuries, Vietnamese Trung Thu developed its own stories, foods, objects, children’s customs and local forms; in some places, other layers of cultural contact are visible as well.

In Hội An, for example, the local heritage centre describes Trung Thu as a tradition shaped not only by the Vietnamese setting but also by long-term contacts created by the old international trading port, including links with China and Japan. A family tree is therefore a better image than a photocopier: several branches share roots, yet they have grown in different directions.

So yes, there is a family resemblance. But Tết Trung Thu is not a Chinese festival wearing Vietnamese number plates.

Children go outside. Ancestors stay at home.

Tết Trung Thu is not just a date. It is light, noise, paper, bamboo, masks, cakes, children and a full moon — and sometimes a very conspicuous lion head that concludes your peaceful evening has been suffering from a serious lack of drums.

In contemporary Vietnam, the festival is strongly associated with children. Lantern processions, toys, masks and dance performances are among its most visible forms, which is why Trung Thu is often described as a children’s festival. But staying only in the street would miss another layer. Frequently described family practices include preparing fruit and cakes, placing them on the ancestors’ altar and later sharing the food. This is not a mandatory script for every household from Hanoi to the Mekong, but it shows how noisy children’s celebration and family memory can coexist within one festival.

So while a child outside may be dealing with a matter of national importance — whether their lantern is better than the neighbour’s — earlier generations of the family may be symbolically present at home. The dignity of the ancestors and a paper carp racing down the street do not cancel each other out. Perhaps it is simply we who feel an irresistible urge to separate every cultural layer, number it and file it in a folder.

And then the food arrives.

Mooncake: when the full moon decides it wants to be baked

Vietnamese mooncakes are one of the foods associated with Trung Thu. Two of the best-known groups are bánh nướng, baked cakes, and bánh dẻo, soft cakes whose outer layer is made from glutinous rice flour. Fillings vary widely, and newer flavours and luxury gift boxes have long existed alongside more traditional combinations. The cakes themselves may be round or square, with elaborate patterns pressed into the surface.

The internet makes it very tempting to assign one universal “ancient meaning” to every shape, egg yolk and seed. Better to slow down. Recipes, fillings and gifting practices differ by region, producer, family and period. What we can safely follow is the cake’s role as a festival food associated with sharing, gifts and, in some households, the family altar.

It also reminds us very efficiently that humans were making energy-dense ceremonial foods long before anyone invented a calorie-counting app.

A scholar sits on the tray. Because even a festival offers no escape from education.

Here is a detail worth stopping for. In older Hanoi festival arrangements, one could find ông Tiến sĩ giấy, a paper figure of a scholar or high examination graduate. Craftswoman Nguyễn Thị Tuyến explained during a Vietnam Museum of Ethnology programme that the paper scholar used to be placed prominently among fruit on the festival tray and expressed parents’ hopes that their children would do well in their studies.

You have a full moon, fruit, sweets and lanterns — and in the middle of it all, an academic expectation made of paper is staring at the child.

Human civilisation is, in the end, remarkably consistent.

Lola inspects the festival tray: “So I get a mooncake?”
“Yes.”
“And the paper gentleman?”
“He reminds you to study.”
Lola is silent for a moment. “Please give me the equinox back.”

Reality supplied an even better punchline. In 2025, the Vietnam Museum of Ethnology, craftswoman Nguyễn Thị Tuyến and young volunteers created an AI Paper Doctor: a moving, interactive version of ông Tiến sĩ giấy that could communicate with children and answer questions about Trung Thu and the museum. The paper scholar therefore travelled from traditional figurine to museum programme and on to robotics and AI. If anyone needs a demonstration of what “living tradition” can mean, this is an unusually enthusiastic candidate.

Hanoi’s festival toy has a history of its own — and it is wilder than it looks

Search for images of Hanoi during Trung Thu today and you will very quickly encounter Hàng Mã: red, yellow, masks, lanterns, more lanterns, and after the twentieth photograph the suspicion that Hanoi was created primarily so Pinterest could eventually exist.

The historical map is more interesting. The Vietnam National Museum of History cites an older description by Hoàng Đạo Thúy in which Hàng Gai became an enormous market for paper toys at the beginning of the eighth lunar month. There were paper elephants and horses, rabbits, toads, carp turning into dragons, lion heads and đèn kéo quân. Children’s Trung Thu was also a showcase of materials, mechanisms and craft imagination.

Then comes 1905. In 1904 the Frenchman George Bois proposed to the colonial administration a regular Hanoi competition for paper toys made for Trung Thu, and the first contest took place the following year. Archival materials show that the competitions continued and that work by Vietnamese craftspeople also reached the Trocadéro in Paris, attracting attention in the French press. The colonial context and the language of the period must be kept in view, but the documents also show something important: local makers were recognised for turning paper, bamboo, sheet metal and simple mechanisms into remarkably lively toys.

The year 1946 added another turn. The newspaper Cứu quốc printed an appeal to Hanoi makers of votive paper objects, encouraging them to transfer their skills to children’s toys as well. The text called for new, simple, attractive and “scientific” toys and explicitly encouraged the transformation of older models. In other words, what we now call a “traditional toy” did not have to remain frozen in one form for centuries. It changed with markets, politics, ideas about education and what new generations of children wanted.

Tradition, in short, does not have a “save as PDF and never edit again” button.

A tiny paper cinema that needed no battery

And then there is đèn kéo quân. At first glance, a lantern. Inside it, however, heat goes to work: the flame warms the air, the rising current turns a light mechanism, and figures begin to move. Their shadows are projected onto the lantern wall, so people, animals, soldiers or entire miniature scenes travel around it. The APD art centre has even used this tradition as one historical starting point for thinking about moving images.

It is lantern, physics experiment and tiny cinema in one. No battery, no app, no firmware update and no message saying “this device is no longer supported by the manufacturer”.

Lola: “So the whole thing runs on hot air?”
Yes.
“Like internet comments?”
Not exactly, Lola.

This is a useful reminder that a “simple traditional object” is often simple only to the person who has not yet understood how it is built.

Crab, shrimp and mantis. No, we are not in a restaurant.

Nor is the traditional lantern one single red round object. Hanoi’s Lưu trăng phố cổ 2026 cultural programme presents or reconstructs stars, carp, crabs, shrimp, praying mantises, đèn kéo quân, Sun and Moon lanterns, paper horses, lion heads and other toys. Makers work with older materials and techniques while also reinterpreting some models for contemporary audiences.

That matters for how Vietnamese Trung Thu is viewed from outside. If we reduce it visually to ten identical red lanterns, we do not create “traditional Vietnam”. We create cultural wallpaper.

The real world of toys is much more entertaining: paper, bamboo, bồi giấy, light, shadow, fish, crustaceans, insects, animals, people and mechanisms — somewhere between a craft workshop, a zoo and a physics lab.

Spider-Man arrived in the traditional workshop and the world did not end

Hanoi’s papier-mâché masks offer an even clearer example of change. Craftspeople Nguyễn Văn Hòa and Đặng Hương Lan spent decades making traditional masks of Ông Địa, Thị Nở, buffaloes, horses, tigers and other characters. When parents began asking for contemporary heroes, new moulds appeared too — including Spider-Man and other superheroes.

A purist has just fainted into the tissue paper.

But a craftsperson is not a machine for reproducing one randomly selected year. They make objects for living people. Today’s child knows different characters from their great-grandparent, and a traditional technique may survive precisely because it can make something that great-grandparent never saw.

The question is therefore not only “Is it still authentic?” A much more interesting question is: authentic to which period, for whom, and in what sense?

Tradition is not taxidermy.

Hội An arrives — and brings a celestial dog

After Hanoi, one might expect more lanterns and another lion dance. Hội An instead produces Thiên Cẩu — the celestial dog.

The local heritage centre describes Thiên Cẩu as a specifically Hội An tradition that was prominent in local Trung Thu in the early twentieth century, before the present spread of various lion and dragon forms. Its head is built from bamboo or rattan and paper, with large eyes, prominent ears, a forward-curving horn, a moving lower jaw and whiskers; the long cloth body may end in a bundle of leaves resembling a tail. A traditional troupe is not one person under a piece of fabric either: the source describes more than ten participants, including drums, cymbals, a gong, torches, the Ông Địa character and a bamboo ladder.

Because once a giant celestial dog with a moving jaw and drum accompaniment is running down the street, who would say, “We have everything. The bamboo ladder would just be excessive.”

Lola: “So Hanoi has different lion dances and Hội An has a celestial dog?”
“Yes.”
“And what will the next city have?”
“Lola, do not try to summon a dragon.”

Tết Trung Thu in Hội An was added to Vietnam’s national intangible cultural heritage list in 2023. Local sources connect its development to the distinctive culture of the former trading port and long-term cultural exchange. That is exactly why Hội An is not “Hanoi with prettier lanterns”. It is its own local case.

Chợ Lớn: add trade, migration and thousands of lanterns

Next we move south to historic Chợ Lớn in Ho Chi Minh City. Here Trung Thu does not enter the scene alone. It brings a long Chinese-Vietnamese urban history, migration, commerce, craft, seasonal frenzy — and several thousand lanterns for good measure, because subtlety was apparently not in the brief.

The well-known lantern streets around Lương Nhữ Học and nearby routes light up before Trung Thu with both traditional and modern lanterns, shops bring out seasonal goods and the area becomes a magnet for visitors. Municipal sources emphasise that this is not a randomly selected “Instagram street”, but a neighbourhood with long-established residents of Chinese origin and a deep commercial history. The lanterns did not fall from the sky five minutes before the first portrait-mode phone arrived.

That makes Chợ Lớn no less interesting when people are buying, selling, bargaining and taking photographs. Quite the opposite. It is historically a commercial urban space. Market activity, migration, craft and cultural exchange are not vulgar additions glued onto a laboratory-pure “tradition”; they are part of the way the tradition lives in the city.

The idea that a real tradition must stand quietly in a corner untouched by trade, tourists and mobile phones is itself a rather romantic story. People have always sold things, borrowed ideas, adapted them, taken objects home and shown them to neighbours. Today we have added the selfie. Civilisation has survived so far.

And again the convenient sentence “This is how Trung Thu is celebrated in Vietnam” falls apart. Hanoi gave us one urban form, Hội An another, and Chợ Lớn adds a Chinese-Vietnamese, commercial, migratory and strongly urban layer.

And we have still visited only three particular urban worlds.

Vietnam clearly has no intention of making life easy for writers who begin sentences with “Vietnamese people traditionally…”

Every time we think we have a neat summary, another city, community or historical layer appears and knocks it off the table with an amused expression.

Which I respect.

Reluctantly.

Spreadsheets like order. Culture has evidently chosen other hobbies.

And the harvest? Rice refuses one national date.

A harvest layer is traditionally associated with Trung Thu. But here another attractive shortcut appears: “Vietnam harvests rice in September.”

If only.

FAO distinguishes several major rice seasons in Vietnam, commonly including Mùa, Hè–Thu and Đông–Xuân. But as soon as we happily draw three tidy columns in a table, Vietnam takes the pen away and says: “That would be too easy.”

The rice calendar is not the same in the Red River Delta, the central coast and the Mekong Delta. Double- and triple-cropping systems are common in parts of the Mekong, while the north follows other cycles, environmental conditions and seasonal rhythms. Instead of one “Vietnamese harvest season”, we get an agricultural mosaic that changes from region to region almost as eagerly as April weather.

And then comes the sentence that finally destroys the tidy picture: somewhere in Vietnam, rice is harvested in practically every month of the year.

That is very rude to articles hoping to write “autumn brings the rice harvest” and move on.

They cannot.

Vietnam is clearly keeping its own calendar. And it refuses to simplify it for us.

That does not mean a September harvest is invented. It simply needs an address.

In the mountainous area of Mù Cang Chải, for example, the rice terraces turn gold in September and October and the main harvest period arrives. Among local Hmong communities, ripening rice is also connected with Lễ mừng cơm mới, the “new rice” ceremony. A local official cultural source describes it as a family agricultural rite usually held around late September and early October, in which the first new rice is connected with thanks to deities and ancestors and wishes for another good year. That is a specific community, a specific landscape and a specific harvest rhythm — not permission to paint the same story over the whole map of Vietnam.

The circle now begins to close. The equinox gave us one precise astronomical moment. Rice has just explained why we should not look for one agricultural moment for the whole country.

The rain really does not ask anyone about September 23

Weather has even less respect for neatly ruled calendars. Monsoon regimes differ between the north, central regions, the Central Highlands and the south, and in central Vietnam September can mark the beginning of the wetter part of the year just as a European reader is picturing a romantic “first day of autumn”. The year 2026 provides a particularly useful live example, because Vietnamese weather has decided not to cooperate with any simple autumn picture.

According to Vietnam’s National Center for Hydrometeorological Forecasting, average temperatures in September 2026 are expected to be around 0.5–1 °C above the long-term average across most of the country. Fine, you may think, at least that is straightforward. Not so fast. In the north and the Thanh Hóa–Hà Tĩnh belt, rainfall is expected to be roughly 20–40% below normal; in the south, about 5–15% below; while the Central Highlands, refusing the shared script as usual, may receive roughly 10–20% more rain than normal.

So if we tried to write one universal sentence such as “Vietnam is warmer and drier in September”, Vietnam would take it away, cross it out and add several regional footnotes. Tropical cyclone activity and direct land impacts are expected to remain roughly around the long-term norm. In other words: warmer than average, drier in some places, wetter in others, and cyclones roughly normal. The meteorological answer to “What is the weather like in Vietnam in September?” is therefore approximately: yes.

These figures will of course be different next year. This is the annual update layer and must be checked again. The enduring part of the story remains: the equinox does not start the monsoon, end the rainy season or send calendar invitations to clouds. Rain simply declines to cooperate.

Then the Mường arrive with twelve pieces of bamboo

If the Sun, a lunisolar festival calendar, several rice seasons and a monsoon already seem like enough time systems for one article, along comes Lịch Đoi.

Lịch Đoi, often described as a “bamboo calendar”, is traditional calendrical knowledge of Mường communities in the Hòa Bình area. It works with observations of the Moon and the star or star group called Đoi, and the knowledge can be recorded on twelve bamboo tablets, one corresponding to each month. Marks on the tablets helped distinguish days and situations relevant to farming and other activities, from work and house-building to weddings. In 2022, this calendrical knowledge was added to Vietnam’s national list of intangible cultural heritage.

Twelve pieces of bamboo, observation of the sky, work, weather, weddings, auspicious and inauspicious days. The year has now definitively refused to fit into a simple contest between “solar” and “lunar”.

Lola takes out her phone calendar: “So the Sun has its date, Trung Thu has its own, the Mường brought bamboo tablets, rice has several shifts and the monsoon did not show up?”
She looks at the phone for a moment and puts it away again.
“Fine. I’ll ask what’s for dinner.”

Possibly the sensible decision.

Since we are with the Mường, the beads finally arrive

Because this is BeadCulture and we have just spent several paragraphs on calendars, rice and meteorology, it is time to ask the question that has been pacing nervously in the hallway: what about jewellery?

With Mường communities in Hòa Bình, there is no need to manufacture a connection out of editorial air. Traditional women’s dress can be accompanied by silver bracelets, beaded necklaces and silver chain ornaments known as xà tích. And beads are, for us, a small editorial Christmas. Vietnamese descriptions of Mường dress mention strings of coloured stone beads, sometimes cut into diamond-like or faceted forms, valued in part because they were not easy to obtain. Silver bracelets could be flat or rounded and decorated with plant motifs, while xà tích hung at the waist and could be more than ornament: it might also visibly express wealth and social position.

The important brake is not to turn this into “equinox jewellery”. Lịch Đoi, a beaded necklace and September 23 are not secret accomplices in one ritual. Their connection is different and more interesting: they belong to different layers of cultural life in the same community. One object helps organise time; another adorns the body and may carry value, status or family memory. Culture is not one symbolic soup in which everything automatically means everything else.

That is exactly where BeadCulture feels at home. A bead does not need to be a “symbol of autumn” to deserve attention. It is enough that it shows another way culture is written into material — this time not into a calendar, but directly onto the body.

And the Moon is not the same festival everywhere either

Just when we think we have finally organised the picture — full moon, rice, harvest, lanterns, Vietnam — another small act of cultural sabotage arrives. The Moon does not mean the same festival everywhere. Among Khmer communities in southern Vietnam there is an important lunar and harvest festival called Ok Om Bok. At first glance one might notice the full moon, crops and food and think: another version of Trung Thu. This is exactly where we should stop before cultural similarities dissolve into one large bowl of moonlit porridge.

Ok Om Bok is celebrated at the full moon of the tenth lunar month, not the eighth, and belongs to its own Khmer cultural and ritual setting. It is connected with thanking the Moon for the harvest, and characteristic offerings include cốm dẹp, flattened young rice. In Trà Vinh province, the tradition has been recognised as national intangible cultural heritage. So we have a full moon, a harvest, rice and gratitude — and still not the same festival. That is precisely the moment when the sentence “Vietnamese people thank the Moon in autumn” starts wobbling dangerously.

Who exactly are “Vietnamese people” in that sentence? Which community? Which lunar month? Which tradition? Which story? Tết Trung Thu and Ok Om Bok can stand next to each other and share several striking ingredients, but cultural traditions are not recipes in which the same ingredients automatically produce the same cake. Once we stop searching for one universal “Vietnamese moon tradition”, the picture becomes much more interesting: Vietnam is not one calendar, one community or one relationship with the Moon.

Similarity, then, is not the answer. It is the moment when another question should begin.

So what really begins in Vietnam on September 23?

What really begins in Vietnam on September 23? Astronomical autumn. Full stop. Earth passes a precisely defined point in its journey around the Sun, day and night move towards balance, and astronomers can happily close the spreadsheet. We could stop there if BeadCulture were a department of calendar definitions and our life’s mission were to fill in the “date” and “time” boxes correctly. Fortunately, it is not. What is much more interesting than what begins with the equinox is everything that refuses to obey it.

Tết Trung Thu does not move to the starting line because of it. Rice from the northern terraces to the Mekong does not receive a mass instruction to “harvest”. The monsoon does not glance at the calendar and decide that at 02:05 it must change season. Vietnam does not switch from SUMMER to AUTUMN on September 23 like an air conditioner responding to a remote control. And the time systems of individual communities certainly do not dissolve because one astronomical instant has arrived. The universe may be precise about this. People, rain, rice and cultural history plainly have other working procedures.

That is why the equinox is such a useful place from which to look at Vietnam. Not because it lines the country up in one tidy autumn row, but because it does the opposite: it reveals how many different rows are moving beside one another at the same time. Just two days after this year’s equinox, Hanoi reaches Rằm tháng Tám and lanterns move through the streets. In workshops, paper, bamboo and colour become stars, fish, crabs and masks. Hội An brings its celestial dog into the moonlit story. Chợ Lớn lights up the lantern layer of its Chinese-Vietnamese commercial history. On some northern terraces the rice is turning gold, while hundreds of kilometres away the agricultural year is dealing with a completely different chapter.

And even that is not the end. Mường Lịch Đoi shows that time does not have to be organised only according to the systems we take for granted. Khmer Ok Om Bok waits for the full moon of another lunar month and reminds us that even the combination of Moon, harvest and rice does not automatically mean the same festival. Add regional weather, several rice seasons, local histories and urban traditions, and the apparently simple question “When does autumn begin in Vietnam?” becomes a cultural, climatic and astronomical puzzle within minutes. Vietnam has once again refused to fit into one column. I am beginning to suspect it does this on purpose.

Perhaps that is the real magic of the September equinox. It is not a magic button that sets a new season for an entire country. It is a fixed point around which we can see much more clearly everything that is not fixed. One astronomical moment, beside lunar festivals, local calendars, harvests, monsoons, migration, urban traditions and cultural memory — each layer ticking in its own way.

The same sky. Many clocks. And none of them is obliged to show the same time.

So when the calendar tells us on September 23 that autumn has just begun, we can believe it.

We simply should not ask it to explain Vietnam for us.

FAQ: Autumn Equinox in Vietnam