Understand · Seasons
When to go: seasons and festivals
The delta has two seasons, a flood that changes the upper delta every autumn, and two festivals that change everything around them. Here is how each affects a heritage journey, with the figures and dates we could source.
Overview
The year at a glance
Based on Can Tho climate normals (dry December–April, rainy May–November) and VNAT’s Sep–Nov flood-season advice for Chau Doc.
In short: December to April is dry and the easiest time for a long journey. May to November brings rain, mostly in heavy afternoon showers, and the upper delta floods from about September. Neither season closes the pagodas, temples or mosques; what changes is heat, mosquitoes, river levels and the reliability of boats.
Sources: Wikipedia — Cần Thơ (climate table); Vietnam National Authority of Tourism — Mekong Delta; Vietnam National Authority of Tourism — Chau Doc · checked .
Month by month: temperature and rain
| Month | Mean max °C | Rain (mm) | Rain days | For a heritage journey |
|---|---|---|---|---|
| January | 30.2 | 10 | 2 | Dry, coolest; a good month |
| February | 31.2 | 3.8 | 0.8 | Driest month |
| March | 32.7 | 15 | 1.8 | Hot and dry |
| April | 33.9 | 42 | 5.6 | Hottest; keep to early mornings |
| May | 33.2 | 223 | 16.4 | Rains begin |
| June | 32.0 | 310 | 19.9 | Rainy; dengue season begins |
| July | 31.4 | 336 | 21.5 | Rainy |
| August | 31.2 | 338 | 21.6 | Rainy; water rising upstream |
| September | 31.1 | 451 | 22.1 | Wettest; flood season upstream |
| October | 31.0 | 301 | 21.8 | Flood peak upstream; king tides |
| November | 30.7 | 137 | 13.6 | Drying out; Ok Om Bok often falls now |
| December | 29.7 | 42 | 6.5 | Dry; a good month |
Figures are Can Tho climate normals, the nearest published series for most of our routes. Dengue in Vietnam peaks from June to October, mostly in the centre and south, so repellent matters in the rainy months.
Sources: Wikipedia — Cần Thơ (climate table); WHO Viet Nam — dengue · checked .
The festivals
| Festival | Community | Lunar date | Where | What we know about the solar date |
|---|---|---|---|---|
| Bà Chúa Xứ festival | Kinh, with Khmer, Cham and Hoa | 22nd–27th day of the fourth lunar month (UNESCO); main rituals on the 25th (Việt Nam News) | Sam Mountain, Chau Doc | Falls in May or June; we confirm each year |
| Ok Om Bok | Khmer | Full moon of the tenth lunar month | Soc Trang (races), Tra Vinh (lanterns) | 2025: 3–5 November (Can Tho city edition) |
The Bà Chúa Xứ festival was inscribed in 2024 on UNESCO’s Representative List of the Intangible Cultural Heritage of Humanity. It brings very large crowds to Sam Mountain: plan for heat, queues and full hotels, and book early. Ok Om Bok has been national intangible heritage since 2022; in 2025 it featured 60 ghe Ngo teams on the Maspéro river and a moon offering at Chùa Kh’leang.
We do not publish future solar dates until the organisers announce them. The Festival Journey is built to fit either festival.
Sources: UNESCO — Festival of Bà Chúa Xứ Goddess at Sam Mountain; Việt Nam News, 5 Dec 2024; Doanh nghiệp Hội nhập, 3 Nov 2025 — Ok Om Bok 2025; Báo Đại biểu Nhân dân, 28 Oct 2025 — Ok Om Bok · checked .
The flood season
Every year the Mekong rises and spreads across the upper delta. VNAT recommends September to November at Chau Doc, when the floodwaters fill the Tra Su forest. In 2025 the government forecast the flood peak at Tan Chau and Chau Doc for 8–13 October, with levels around alarm levels I–II and well below the 2000 records. Downstream, riverside streets in Can Tho and Vinh Long flood at the highest tides in October and November, and residents were advised to limit travel during high tide hours.
For a cultural journey the flood is mostly scenery, and road travel continues. What it changes is boats — river cruise ships sometimes cannot reach Chau Doc under low bridges in high water — and the timing of a few riverside visits.
Sources: Vietnam National Authority of Tourism — Chau Doc; Ministry of Agriculture and Environment, 3 Oct 2025 — flood bulletin; Pandaw — Saigon to Phnom Penh itinerary PDF · checked .
Which months for which journey
| Journey | Good months | Watch for |
|---|---|---|
| The Khmer Delta | December–April; November for Ok Om Bok | April heat; festival hotel prices |
| Festival Journey | Fourth or tenth lunar month only | Crowds; dates confirmed late |
| The Four Cultures | December–April | Bà Chúa Xứ week at Chau Doc unless wanted |
| Delta to the Sea | December–April | Wind and rain for the Phu Quoc boat, May–November |
What the rainy season is really like
Rain in the delta usually comes as heavy showers rather than all-day drizzle, and the September total at Can Tho is about 451 mm over some 22 rainy days. You will get wet, and some boat crossings may wait for a storm to pass, but a pagoda visit rarely needs to be cancelled. In return, the landscape is green, the fields full, and the towns quieter outside the festivals.
If you can choose, December to February combines dry weather with the coolest temperatures of the year — still around 30 °C by day.
Sources: Wikipedia — Cần Thơ (climate table) · checked .
Common questions
Questions travellers ask most
Is the rainy season a bad time for a cultural trip?
Not a bad time, a different one. Sites stay open; you plan around afternoon showers and mosquitoes.
When is Ok Om Bok this year?
At the full moon of the tenth lunar month. The organisers set the programme each year; in 2025 it ran 3 to 5 November. We confirm dates when you enquire.
Does the flood stop travel to Chau Doc?
Not by road. It can stop large river cruise ships reaching Chau Doc under low bridges.
What about Tết, the Lunar New Year?
Many businesses close for several days and hotels and transport are busy. We can plan a journey then, but say so early and expect fewer choices.
Related
Read next
Example journey
Festival Journey
Six days timed to the Bà Chúa Xứ festival at Chau Doc, or to Ok Om Bok in Soc Trang.
View this journeyDestinations · Kinh, Cham, Khmer, Hoa
Chau Doc & Sam Mountain
Chau Doc: Sam Mountain, Bà Chúa Xứ, the Cham villages, nights, access and costs.
View this journeyDestinations · Khmer and Hoa heritage
Soc Trang
Soc Trang: Khmer pagodas, the Bat pagoda, Ok Om Bok, and how to plan your nights.
View this journeyUnderstand · Culture
The four cultures
Who the Khmer, Kinh, Hoa and Cham of the delta are, and where to see their heritage.
View this journeyTours
Tours
Four private cultural routes of five to eight days, compared side by side.
View this journeyDestinations
Destinations
Tra Vinh, Soc Trang, Chau Doc and Ha Tien: nights, access, costs and when to skip.
View this journeyStart planning
Tell us about the journey you have in mind
A month, how many are travelling and the communities or festival that interest you are enough to start. We reply by email with questions or a first route and its heritage table.