Dien Bien Phu weather in September
In September, Dien Bien Phu sees average daytime highs of 28°C and overnight lows near 21°C, with 199 mm of rain across 21.5 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.
Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 12% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Dien Bien Phu's 9th-clearest and 12th-windiest month. For the whole year in context, see Dien Bien Phu's year-round climate.
- Daytime high
- 28°
- 4th warmest
- Overnight low
- 21°
- 9th coldest
- Rainfall
- 199 mm
- 21.5 wet days
- Daylight
- 12 h 06 min
- 5:59 AM – 6:06 PM
- Cloud cover
- 75%
- 9th clearest
- Wind
- 3 km/h
- 12th windiest
- Solar energy
- 4.41 kWh/m²
- Travel score
- 4.4
- out of 10
Dien Bien Phu is city in Điện Biên, Vietnam.
- Density
- 1,317/km²
- people per km²
- Founded
- 1992
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 28°C through the month.
A typical September day in Dien Bien Phu reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 30°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 28 | 22 |
| 2 | 28 | 22 |
| 3 | 28 | 22 |
| 4 | 28 | 21 |
| 5 | 28 | 21 |
| 6 | 28 | 21 |
| 7 | 28 | 21 |
| 8 | 28 | 21 |
| 9 | 28 | 21 |
| 10 | 28 | 21 |
| 11 | 28 | 21 |
| 12 | 28 | 21 |
| 13 | 28 | 21 |
| 14 | 28 | 21 |
| 15 | 28 | 21 |
| 16 | 28 | 21 |
| 17 | 28 | 21 |
| 18 | 28 | 21 |
| 19 | 28 | 21 |
| 20 | 28 | 21 |
| 21 | 28 | 21 |
| 22 | 28 | 21 |
| 23 | 28 | 21 |
| 24 | 28 | 21 |
| 25 | 28 | 21 |
| 26 | 28 | 20 |
| 27 | 28 | 20 |
| 28 | 28 | 20 |
| 29 | 28 | 20 |
| 30 | 28 | 20 |
Dien Bien Phu weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 4th-wettest month here — the current month is highlighted below.
| 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 September
The sky is clear or mostly clear about 12% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 74%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 16 | 16 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 20 | 20 | 21 | 22 | 22 | 24 | 24 | 25 | 27 | 28 | 29 | 32 | 32 | 34 | 35 | 37 | 38 | 39 | 40 | 41 | 43 |
| Cloudier (%) | 84 | 84 | 82 | 82 | 82 | 82 | 81 | 81 | 81 | 80 | 80 | 79 | 78 | 78 | 76 | 76 | 75 | 73 | 72 | 71 | 68 | 68 | 66 | 65 | 63 | 62 | 61 | 60 | 59 | 57 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 16 | 84 |
| 2 | 16 | 84 |
| 3 | 18 | 82 |
| 4 | 18 | 82 |
| 5 | 18 | 82 |
| 6 | 18 | 82 |
| 7 | 19 | 81 |
| 8 | 19 | 81 |
| 9 | 19 | 81 |
| 10 | 20 | 80 |
| 11 | 20 | 80 |
| 12 | 21 | 79 |
| 13 | 22 | 78 |
| 14 | 22 | 78 |
| 15 | 24 | 76 |
| 16 | 24 | 76 |
| 17 | 25 | 75 |
| 18 | 27 | 73 |
| 19 | 28 | 72 |
| 20 | 29 | 71 |
| 21 | 32 | 68 |
| 22 | 32 | 68 |
| 23 | 34 | 66 |
| 24 | 35 | 65 |
| 25 | 37 | 63 |
| 26 | 38 | 62 |
| 27 | 39 | 61 |
| 28 | 40 | 60 |
| 29 | 41 | 59 |
| 30 | 43 | 57 |
Chance of precipitation in September
Dien Bien Phu gets around 199 mm of rain over 21.5 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 71% and peaks near 86% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 86 | 86 | 85 | 84 | 83 | 82 | 81 | 80 | 79 | 79 | 78 | 77 | 76 | 74 | 73 | 72 | 71 | 70 | 69 | 67 | 66 | 64 | 63 | 61 | 60 | 58 | 56 | 55 | 53 | 52 |
| Rain chance (%) | |
|---|---|
| 1 | 86 |
| 2 | 86 |
| 3 | 85 |
| 4 | 84 |
| 5 | 83 |
| 6 | 82 |
| 7 | 81 |
| 8 | 80 |
| 9 | 79 |
| 10 | 79 |
| 11 | 78 |
| 12 | 77 |
| 13 | 76 |
| 14 | 74 |
| 15 | 73 |
| 16 | 72 |
| 17 | 71 |
| 18 | 70 |
| 19 | 69 |
| 20 | 67 |
| 21 | 66 |
| 22 | 64 |
| 23 | 63 |
| 24 | 61 |
| 25 | 60 |
| 26 | 58 |
| 27 | 56 |
| 28 | 55 |
| 29 | 53 |
| 30 | 52 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 61% of days. Sticky, muggy-or-worse air turns up on roughly 95% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 |
| Humid (%) | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 6 | 7 | 7 | 8 | 9 | 10 | 11 | 12 | 12 | 13 |
| Muggy (%) | 14 | 15 | 16 | 18 | 19 | 21 | 22 | 24 | 25 | 26 | 28 | 29 | 31 | 32 | 34 | 35 | 36 | 38 | 39 | 40 | 41 | 42 | 44 | 45 | 47 | 48 | 50 | 51 | 53 | 54 |
| Oppressive (%) | 86 | 85 | 83 | 81 | 80 | 78 | 77 | 75 | 74 | 72 | 70 | 69 | 67 | 65 | 63 | 61 | 60 | 58 | 56 | 55 | 53 | 51 | 48 | 46 | 44 | 41 | 39 | 36 | 34 | 32 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|
| 1 | 0 | 0 | 14 | 86 |
| 2 | 0 | 0 | 15 | 85 |
| 3 | 0 | 1 | 16 | 83 |
| 4 | 0 | 1 | 18 | 81 |
| 5 | 0 | 1 | 19 | 80 |
| 6 | 0 | 1 | 21 | 78 |
| 7 | 0 | 1 | 22 | 77 |
| 8 | 0 | 1 | 24 | 75 |
| 9 | 0 | 1 | 25 | 74 |
| 10 | 0 | 2 | 26 | 72 |
| 11 | 0 | 2 | 28 | 70 |
| 12 | 0 | 2 | 29 | 69 |
| 13 | 0 | 2 | 31 | 67 |
| 14 | 0 | 3 | 32 | 65 |
| 15 | 0 | 3 | 34 | 63 |
| 16 | 0 | 4 | 35 | 61 |
| 17 | 0 | 4 | 36 | 60 |
| 18 | 0 | 4 | 38 | 58 |
| 19 | 0 | 5 | 39 | 56 |
| 20 | 0 | 5 | 40 | 55 |
| 21 | 0 | 6 | 41 | 53 |
| 22 | 0 | 7 | 42 | 51 |
| 23 | 0 | 7 | 44 | 48 |
| 24 | 0 | 8 | 45 | 46 |
| 25 | 0 | 9 | 47 | 44 |
| 26 | 1 | 10 | 48 | 41 |
| 27 | 1 | 11 | 50 | 39 |
| 28 | 1 | 12 | 51 | 36 |
| 29 | 1 | 12 | 53 | 34 |
| 30 | 1 | 13 | 54 | 32 |
Wind in September
Winds average 3 km/h in September, the calmest month.
Across September, daily wind ranges from about 3 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 3 | calm |
| 2 | 3 | calm |
| 3 | 3 | calm |
| 4 | 3 | calm |
| 5 | 3 | calm |
| 6 | 3 | calm |
| 7 | 3 | calm |
| 8 | 3 | calm |
| 9 | 3 | calm |
| 10 | 3 | calm |
| 11 | 3 | calm |
| 12 | 3 | calm |
| 13 | 3 | calm |
| 14 | 3 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 4 | calm |
| 20 | 4 | calm |
| 21 | 4 | calm |
| 22 | 4 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over September. Sunrise moves from 5:55 AM to 6:02 AM, and sunset from 6:21 PM to 5:52 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 |
| Sunrise (AM) | 5:55 | 5:55 | 5:55 | 5:55 | 5:56 | 5:56 | 5:56 | 5:57 | 5:57 | 5:57 | 5:57 | 5:58 | 5:58 | 5:58 | 5:58 | 5:59 | 5:59 | 5:59 | 5:59 | 6:00 | 6:00 | 6:00 | 6:00 | 6:01 | 6:01 | 6:01 | 6:02 | 6:02 | 6:02 | 6:02 |
| Sunset (PM) | 6:21 | 6:20 | 6:19 | 6:18 | 6:17 | 6:16 | 6:15 | 6:14 | 6:13 | 6:12 | 6:11 | 6:10 | 6:09 | 6:08 | 6:07 | 6:06 | 6:05 | 6:04 | 6:03 | 6:02 | 6:01 | 6:00 | 5:59 | 5:58 | 5:57 | 5:56 | 5:55 | 5:54 | 5:53 | 5:52 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 5:55 | 6:21 |
| 2 | 12.4 | 5:55 | 6:20 |
| 3 | 12.4 | 5:55 | 6:19 |
| 4 | 12.4 | 5:55 | 6:18 |
| 5 | 12.3 | 5:56 | 6:17 |
| 6 | 12.3 | 5:56 | 6:16 |
| 7 | 12.3 | 5:56 | 6:15 |
| 8 | 12.3 | 5:57 | 6:14 |
| 9 | 12.3 | 5:57 | 6:13 |
| 10 | 12.2 | 5:57 | 6:12 |
| 11 | 12.2 | 5:57 | 6:11 |
| 12 | 12.2 | 5:58 | 6:10 |
| 13 | 12.2 | 5:58 | 6:09 |
| 14 | 12.2 | 5:58 | 6:08 |
| 15 | 12.1 | 5:58 | 6:07 |
| 16 | 12.1 | 5:59 | 6:06 |
| 17 | 12.1 | 5:59 | 6:05 |
| 18 | 12.1 | 5:59 | 6:04 |
| 19 | 12.1 | 5:59 | 6:03 |
| 20 | 12.0 | 6:00 | 6:02 |
| 21 | 12.0 | 6:00 | 6:01 |
| 22 | 12.0 | 6:00 | 6:00 |
| 23 | 12.0 | 6:00 | 5:59 |
| 24 | 12.0 | 6:01 | 5:58 |
| 25 | 11.9 | 6:01 | 5:57 |
| 26 | 11.9 | 6:01 | 5:56 |
| 27 | 11.9 | 6:02 | 5:55 |
| 28 | 11.9 | 6:02 | 5:54 |
| 29 | 11.8 | 6:02 | 5:53 |
| 30 | 11.8 | 6:02 | 5:52 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.41 kWh/m².
For context, solar energy here swings from a low near 3.4 kWh/m² to a high of 5.44 kWh/m² in April across the year — September's 4.41 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.3 | Bright |
| 2 | 4.3 | Bright |
| 3 | 4.3 | Bright |
| 4 | 4.3 | Bright |
| 5 | 4.3 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.4 | Bright |
| 8 | 4.4 | Bright |
| 9 | 4.4 | Bright |
| 10 | 4.4 | Bright |
| 11 | 4.4 | Bright |
| 12 | 4.4 | Bright |
| 13 | 4.4 | Bright |
| 14 | 4.4 | Bright |
| 15 | 4.4 | Bright |
| 16 | 4.4 | Bright |
| 17 | 4.4 | Bright |
| 18 | 4.4 | Bright |
| 19 | 4.4 | Bright |
| 20 | 4.4 | Bright |
| 21 | 4.4 | Bright |
| 22 | 4.4 | Bright |
| 23 | 4.5 | Bright |
| 24 | 4.5 | Bright |
| 25 | 4.5 | Bright |
| 26 | 4.5 | Bright |
| 27 | 4.5 | Bright |
| 28 | 4.4 | Bright |
| 29 | 4.4 | Bright |
| 30 | 4.4 | Bright |
Hazard calendar for Dien Bien Phu
In September, Dien Bien Phu sits inside 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 September a good time to visit Dien Bien Phu?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Dien Bien Phu for sightseeing.
What to pack for Dien Bien Phu in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Dien Bien Phu sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. About 22 days see rain.
UV index in Dien Bien Phu in September
Clear-sky midday UV in September peaks around 10 (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 September
Average fine-particle pollution (PM2.5) through the year — so you can see where September 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).