Dien Bien Phu in Summer
In summer (June, July and August), Dien Bien Phu sees average daytime highs around 28°C and overnight lows near 22°C, with 1093 mm of rain over about 85 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 3% of the time across summer, and the air most often feels oppressive.
Summer is Dien Bien Phu's weakest season of the year to visit on our travel score. For the whole year in context, see Dien Bien Phu's year-round climate.
- Avg daytime high
- 28°C
- 2nd-warmest season
- Avg overnight low
- 22°C
- Rainfall
- 1093 mm
- 85 wet days
- Avg wind
- 4 km/h
- Travel score
- 3.3
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Dien Bien Phu in Summer
Across summer, daytime highs hold fairly steady around 28°C.
A typical summer day in Dien Bien Phu reaches about 28°C and drops to 22°C overnight. The warmest of the three months is June, the coolest August.
Dien Bien Phu weather by month
How the three summer months (June, July and August) 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 Summer
The sky is clear or mostly clear about 3% of the time across summer.
Chance of precipitation in Summer
Dien Bien Phu gets around 1093 mm of rain over 85 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 4 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 12 min in early June to 12 h 30 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 4.2 kWh/m².
Hazard calendar for Dien Bien Phu
In summer, 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 summer a good time to visit Dien Bien Phu?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Dien Bien Phu.
What to pack for Dien Bien Phu in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Dien Bien Phu sees daytime highs around 28°C and nights near 22°C. Pack light clothes and rain gear. About 85 days see rain.
UV index in Dien Bien Phu in Summer
Clear-sky midday UV across summer averages around 13 (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 Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer 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.