Dien Bien Phu in Fall
In fall (September, October and November), Dien Bien Phu sees average daytime highs around 26°C and overnight lows near 18°C, with 304 mm of rain over about 39 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 28°C in early September to 23°C by late November. The sky is clear or mostly clear about 24% of the time across fall, and the air most often feels muggy.
Fall is Dien Bien Phu's 2nd-best season to visit on our travel score. For the whole year in context, see Dien Bien Phu's year-round climate.
- Avg daytime high
- 26°C
- 3rd-warmest season
- Avg overnight low
- 18°C
- Rainfall
- 304 mm
- 39 wet days
- Avg wind
- 4 km/h
- Travel score
- 6.1
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Dien Bien Phu in Fall
Over the season highs ease from about 28°C in early September to 23°C by late November.
A typical fall day in Dien Bien Phu reaches about 26°C and drops to 18°C overnight. The warmest of the three months is September, the coolest November.
Dien Bien Phu weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 22° / 11° | 35 | 5 | 10.8 | 7.5 |
| Feb | 24° / 12° | 25 | 4.8 | 11.3 | 7.9 |
| Mar | 27° / 16° | 55 | 8.6 | 11.8 | 6.9 |
| Apr | 29° / 19° | 115 | 15.4 | 12.5 | 5.1 |
| May | 29° / 21° | 195 | 22.2 | 13 | 3.8 |
| Jun | 28° / 22° | 323 | 27.3 | 13.3 | 3.2 |
| Jul | 28° / 22° | 403 | 28.9 | 13.2 | 3.4 |
| Aug | 28° / 22° | 368 | 28.3 | 12.7 | 3.4 |
| Sep | 28° / 21° | 199 | 21.5 | 12.1 | 4.4 |
| Oct | 26° / 19° | 72 | 11.5 | 11.5 | 6.3 |
| Nov | 24° / 15° | 33 | 5.5 | 11 | 7.7 |
| Dec | 22° / 12° | 29 | 4.5 | 10.7 | 7.6 |
Cloud cover in Fall
The sky is clear or mostly clear about 24% of the time across fall.
Chance of precipitation in Fall
Dien Bien Phu gets around 304 mm of rain over 39 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 4 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 24 min in early September to 10 h 48 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.1 kWh/m².
Hazard calendar for Dien Bien Phu
In fall, Dien Bien Phu overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Dien Bien Phu's monsoon runs May–September, when most of the year's rain falls.
Is fall a good time to visit Dien Bien Phu?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Dien Bien Phu for sightseeing.
What to pack for Dien Bien Phu in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Dien Bien Phu sees daytime highs around 26°C and nights near 18°C. Pack light clothes and rain gear. About 39 days see rain.
UV index in Dien Bien Phu in Fall
Clear-sky midday UV across fall averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Dien Bien Phu peaks around August 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 7 | 9 | 11 | 9 | 10 | 14 | 13 | 14 | 10 | 9 | 8 | 6 |
| Level | Very high | Very high | Extreme | Very high | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | Very high |
| Feb | 9 | Very high |
| Mar | 11 | Extreme |
| Apr | 9 | Very high |
| May | 10 | Extreme |
| Jun | 14 | Extreme |
| Jul | 13 | Extreme |
| Aug | 14 | Extreme |
| Sep | 10 | Very high |
| Oct | 9 | Very high |
| Nov | 8 | Very high |
| Dec | 6 | High |
Air quality in Dien Bien Phu in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Dien Bien Phu is worst in April — around 303 µg/m³ PM2.5 (very unhealthy), about 32.6× the cleanest month (August, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 20 | 37 | 107 | 303 | 53 | 11 | 10 | 9 | 11 | 15 | 17 | 19 |
| Level | Moderate | Poor | Unhealthy | Very unhealthy | Poor | Good | Good | Good | Good | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 20 | Moderate |
| Feb | 37 | Poor |
| Mar | 107 | Unhealthy |
| Apr | 303 | Very unhealthy |
| May | 53 | Poor |
| Jun | 11 | Good |
| Jul | 10 | Good |
| Aug | 9 | Good |
| Sep | 11 | Good |
| Oct | 15 | Moderate |
| Nov | 17 | Moderate |
| Dec | 19 | Moderate |
Where is Dien Bien Phu?
Dien Bien Phu sits at 21.4°N, 103.0°E, 485 m above sea level, in Vietnam. The nearest listed city is Mường Lay, 69 km away.
Topography around Dien Bien Phu
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Dien Bien Phu.
Within 3 km, the terrain around Dien Bien Phu has significant variations in elevation — a maximum elevation change of 255 m around an average of 505 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,307 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,010 m.
The land around Dien Bien Phu is covered by trees (36%), cropland (30%) and artificial surfaces (24%) within 3 km, trees (62%) and grassland (23%) within 16 km, and trees (79%) within 80 km.
Vietnam travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B / C / F
- 220 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,066
- 2025
- Happiness
- 6.4 / 10
- World Happiness, 2025
- Safe drinking water
- 59%
- of population, 2024
- Homicide rate
- 1.5
- per 100k, 2011
- Road deaths
- 30.6
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 500
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Dien Bien Phu (21.386°, 103.023°, elevation 485 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.