Sơn La weather in April
In April, Sơn La sees average daytime highs of 29°C and overnight lows near 19°C, with 72 mm of rain across 12.8 wet days and about 12.5 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.
Highs climb over the month, from about 28°C in the first days to 30°C by the end. The sky is clear or mostly clear about 35% of the time in April, and the air most often feels muggy.
Daylight stretches from about 12 h 12 min at the start of April to 12 h 48 min by month's end. Set against the rest of the year, April is Sơn La's 5th-clearest and 5th-windiest month. For the whole year in context, see Sơn La's year-round climate.
- Daytime high
- 29°
- 5th warmest
- Overnight low
- 19°
- 7th coldest
- Rainfall
- 72 mm
- 12.8 wet days
- Daylight
- 12 h 30 min
- 5:50 AM – 6:19 PM
- Cloud cover
- 55%
- 5th clearest
- Wind
- 5 km/h
- 5th windiest
- Solar energy
- 5.26 kWh/m²
- Travel score
- 5.2
- out of 10
Sơn La is the old provincial capital of Son La province, Vietnam.
- Density
- 328/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 28°C in the first days to 30°C by the end.
A typical April day in Sơn La reaches about 29°C in the afternoon and slips back to 19°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 33°C. Set against its neighbours, April runs about 2°C warmer than March and about 1°C cooler than May.
| 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 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Avg low (°C) | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 28 | 18 |
| 2 | 28 | 18 |
| 3 | 28 | 18 |
| 4 | 28 | 18 |
| 5 | 28 | 18 |
| 6 | 28 | 18 |
| 7 | 28 | 18 |
| 8 | 28 | 19 |
| 9 | 29 | 19 |
| 10 | 29 | 19 |
| 11 | 29 | 19 |
| 12 | 29 | 19 |
| 13 | 29 | 19 |
| 14 | 29 | 19 |
| 15 | 29 | 19 |
| 16 | 29 | 19 |
| 17 | 29 | 20 |
| 18 | 29 | 20 |
| 19 | 30 | 20 |
| 20 | 30 | 20 |
| 21 | 30 | 20 |
| 22 | 30 | 20 |
| 23 | 30 | 20 |
| 24 | 30 | 20 |
| 25 | 30 | 20 |
| 26 | 30 | 20 |
| 27 | 30 | 20 |
| 28 | 30 | 21 |
| 29 | 30 | 21 |
| 30 | 30 | 21 |
How April really feels in Sơn La
Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Sơn La weather by month
How April compares with the rest of the year at a glance. April is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 21° / 12° | 24 | 4 | 10.8 | 7.3 |
| Feb | 23° / 13° | 19 | 3.6 | 11.3 | 7.9 |
| Mar | 27° / 16° | 50 | 7.1 | 11.8 | 7.1 |
| Apr | 29° / 19° | 72 | 12.8 | 12.5 | 5.2 |
| May | 30° / 22° | 147 | 19.3 | 13 | 3.7 |
| Jun | 30° / 23° | 209 | 23 | 13.3 | 3.2 |
| Jul | 29° / 23° | 288 | 24.5 | 13.2 | 3.4 |
| Aug | 29° / 22° | 283 | 25.3 | 12.7 | 3.4 |
| Sep | 29° / 21° | 150 | 17.5 | 12.1 | 4.4 |
| Oct | 27° / 19° | 49 | 8.3 | 11.5 | 6.6 |
| Nov | 25° / 16° | 27 | 4.5 | 11 | 7.8 |
| Dec | 22° / 12° | 23 | 3.6 | 10.7 | 7.6 |
Cloud cover in April
The sky is clear or mostly clear about 35% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 21% of April, with mostly cloudy or overcast conditions the remaining 44%.
| 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 (%) | 55 | 55 | 56 | 57 | 56 | 57 | 57 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 56 | 55 | 55 | 55 | 55 | 54 | 54 | 53 | 52 | 51 | 51 |
| Cloudier (%) | 45 | 45 | 44 | 43 | 44 | 43 | 43 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 43 | 43 | 43 | 44 | 45 | 45 | 45 | 45 | 46 | 46 | 47 | 48 | 49 | 49 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 55 | 45 |
| 2 | 55 | 45 |
| 3 | 56 | 44 |
| 4 | 57 | 43 |
| 5 | 56 | 44 |
| 6 | 57 | 43 |
| 7 | 57 | 43 |
| 8 | 58 | 42 |
| 9 | 58 | 42 |
| 10 | 58 | 42 |
| 11 | 58 | 42 |
| 12 | 58 | 42 |
| 13 | 58 | 42 |
| 14 | 58 | 42 |
| 15 | 58 | 42 |
| 16 | 58 | 42 |
| 17 | 57 | 43 |
| 18 | 57 | 43 |
| 19 | 57 | 43 |
| 20 | 56 | 44 |
| 21 | 55 | 45 |
| 22 | 55 | 45 |
| 23 | 55 | 45 |
| 24 | 55 | 45 |
| 25 | 54 | 46 |
| 26 | 54 | 46 |
| 27 | 53 | 47 |
| 28 | 52 | 48 |
| 29 | 51 | 49 |
| 30 | 51 | 49 |
Chance of precipitation in April
Sơn La gets around 72 mm of rain over 12.8 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 42% and peaks near 52% on the wettest days. The odds climb 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 (%) | 36 | 36 | 37 | 37 | 37 | 38 | 38 | 38 | 39 | 39 | 39 | 40 | 40 | 40 | 41 | 42 | 42 | 43 | 44 | 44 | 45 | 46 | 46 | 47 | 48 | 48 | 49 | 50 | 51 | 52 |
| Rain chance (%) | |
|---|---|
| 1 | 36 |
| 2 | 36 |
| 3 | 37 |
| 4 | 37 |
| 5 | 37 |
| 6 | 38 |
| 7 | 38 |
| 8 | 38 |
| 9 | 39 |
| 10 | 39 |
| 11 | 39 |
| 12 | 40 |
| 13 | 40 |
| 14 | 40 |
| 15 | 41 |
| 16 | 42 |
| 17 | 42 |
| 18 | 43 |
| 19 | 44 |
| 20 | 44 |
| 21 | 45 |
| 22 | 46 |
| 23 | 46 |
| 24 | 47 |
| 25 | 48 |
| 26 | 48 |
| 27 | 49 |
| 28 | 50 |
| 29 | 51 |
| 30 | 52 |
Humidity in April
Most of April feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the muggy band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 60% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 7 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Comfortable (%) | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 13 | 13 | 12 | 11 | 11 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 4 |
| Humid (%) | 40 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 34 | 33 | 32 | 31 | 31 | 30 | 29 | 28 | 27 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 19 | 18 | 17 | 17 | 17 | 16 |
| Muggy (%) | 35 | 36 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 52 | 53 | 55 | 56 | 57 | 59 | 59 | 62 | 62 | 62 | 63 | 63 | 63 | 62 | 63 |
| Oppressive (%) | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 11 | 12 | 12 | 13 | 13 | 14 | 15 | 15 | 16 | 17 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 7 | 16 | 40 | 35 | 2 |
| 2 | 6 | 16 | 40 | 36 | 2 |
| 3 | 5 | 16 | 39 | 38 | 2 |
| 4 | 5 | 15 | 38 | 39 | 3 |
| 5 | 4 | 15 | 37 | 40 | 3 |
| 6 | 4 | 15 | 36 | 41 | 4 |
| 7 | 3 | 15 | 35 | 42 | 4 |
| 8 | 3 | 15 | 34 | 43 | 5 |
| 9 | 3 | 14 | 34 | 44 | 5 |
| 10 | 2 | 14 | 33 | 45 | 6 |
| 11 | 2 | 13 | 32 | 46 | 7 |
| 12 | 2 | 13 | 31 | 47 | 7 |
| 13 | 2 | 12 | 31 | 48 | 8 |
| 14 | 1 | 11 | 30 | 49 | 8 |
| 15 | 1 | 11 | 29 | 50 | 9 |
| 16 | 1 | 10 | 28 | 52 | 9 |
| 17 | 1 | 9 | 27 | 53 | 10 |
| 18 | 1 | 9 | 25 | 55 | 10 |
| 19 | 1 | 8 | 24 | 56 | 11 |
| 20 | 1 | 8 | 23 | 57 | 11 |
| 21 | 1 | 7 | 22 | 59 | 11 |
| 22 | 1 | 7 | 21 | 59 | 12 |
| 23 | 0 | 6 | 20 | 62 | 12 |
| 24 | 0 | 6 | 19 | 62 | 13 |
| 25 | 0 | 6 | 19 | 62 | 13 |
| 26 | 0 | 5 | 18 | 63 | 14 |
| 27 | 0 | 5 | 17 | 63 | 15 |
| 28 | 0 | 5 | 17 | 63 | 15 |
| 29 | 0 | 5 | 17 | 62 | 16 |
| 30 | 0 | 4 | 16 | 63 | 17 |
Wind in April
Winds average 5 km/h in April.
Across April, daily wind ranges from about 5 km/h on the calmest days to 6 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) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| 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 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | calm |
| 5 | 6 | calm |
| 6 | 6 | calm |
| 7 | 6 | calm |
| 8 | 6 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 12 min at the start of April to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 36 minutes over April. Sunrise moves from 6:03 AM to 5:39 AM, and sunset from 6:14 PM to 6:24 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) | 12.2 | 12.2 | 12.2 | 12.2 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.8 |
| Sunrise (AM) | 6:03 | 6:03 | 6:02 | 6:01 | 6:00 | 5:59 | 5:58 | 5:57 | 5:56 | 5:55 | 5:54 | 5:53 | 5:52 | 5:52 | 5:51 | 5:50 | 5:49 | 5:48 | 5:47 | 5:47 | 5:46 | 5:45 | 5:44 | 5:43 | 5:43 | 5:42 | 5:41 | 5:40 | 5:40 | 5:39 |
| Sunset (PM) | 6:14 | 6:15 | 6:15 | 6:15 | 6:16 | 6:16 | 6:16 | 6:17 | 6:17 | 6:17 | 6:18 | 6:18 | 6:18 | 6:19 | 6:19 | 6:19 | 6:20 | 6:20 | 6:20 | 6:21 | 6:21 | 6:21 | 6:22 | 6:22 | 6:22 | 6:23 | 6:23 | 6:24 | 6:24 | 6:24 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.2 | 6:03 | 6:14 |
| 2 | 12.2 | 6:03 | 6:15 |
| 3 | 12.2 | 6:02 | 6:15 |
| 4 | 12.2 | 6:01 | 6:15 |
| 5 | 12.3 | 6:00 | 6:16 |
| 6 | 12.3 | 5:59 | 6:16 |
| 7 | 12.3 | 5:58 | 6:16 |
| 8 | 12.3 | 5:57 | 6:17 |
| 9 | 12.3 | 5:56 | 6:17 |
| 10 | 12.4 | 5:55 | 6:17 |
| 11 | 12.4 | 5:54 | 6:18 |
| 12 | 12.4 | 5:53 | 6:18 |
| 13 | 12.4 | 5:52 | 6:18 |
| 14 | 12.4 | 5:52 | 6:19 |
| 15 | 12.5 | 5:51 | 6:19 |
| 16 | 12.5 | 5:50 | 6:19 |
| 17 | 12.5 | 5:49 | 6:20 |
| 18 | 12.5 | 5:48 | 6:20 |
| 19 | 12.5 | 5:47 | 6:20 |
| 20 | 12.6 | 5:47 | 6:21 |
| 21 | 12.6 | 5:46 | 6:21 |
| 22 | 12.6 | 5:45 | 6:21 |
| 23 | 12.6 | 5:44 | 6:22 |
| 24 | 12.6 | 5:43 | 6:22 |
| 25 | 12.7 | 5:43 | 6:22 |
| 26 | 12.7 | 5:42 | 6:23 |
| 27 | 12.7 | 5:41 | 6:23 |
| 28 | 12.7 | 5:40 | 6:24 |
| 29 | 12.7 | 5:40 | 6:24 |
| 30 | 12.8 | 5:39 | 6:24 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 5.26 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 3.14 kWh/m² to a high of 5.26 kWh/m² in April across the year — April's 5.26 kWh/m² sits near the top of that range.
| 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) | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 |
| 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 | 5.0 | Bright |
| 2 | 5.0 | Bright |
| 3 | 5.0 | Bright |
| 4 | 5.0 | Bright |
| 5 | 5.0 | Bright |
| 6 | 5.1 | Bright |
| 7 | 5.1 | Bright |
| 8 | 5.1 | Bright |
| 9 | 5.2 | Bright |
| 10 | 5.2 | Bright |
| 11 | 5.2 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.3 | Bright |
| 14 | 5.3 | Bright |
| 15 | 5.3 | Bright |
| 16 | 5.3 | Bright |
| 17 | 5.3 | Bright |
| 18 | 5.4 | Bright |
| 19 | 5.4 | Bright |
| 20 | 5.4 | Bright |
| 21 | 5.4 | Bright |
| 22 | 5.4 | Bright |
| 23 | 5.4 | Bright |
| 24 | 5.4 | Bright |
| 25 | 5.4 | Bright |
| 26 | 5.4 | Bright |
| 27 | 5.4 | Bright |
| 28 | 5.4 | Bright |
| 29 | 5.4 | Bright |
| 30 | 5.4 | Bright |
Hazard calendar for Sơn La
None of Sơn La's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Sơn La's monsoon runs May–September, when most of the year's rain falls.
Is April a good time to visit Sơn La?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a reasonable time to visit Sơn La for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Sơn La in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Sơn La sees daytime highs around 29°C and nights near 19°C. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.
UV index in Sơn La in April
Clear-sky midday UV in April peaks 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 Sơn La peaks around June 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 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 | 11 | 14 | 13 | 13 | 9 | 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 | 11 | Extreme |
| Jun | 14 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 9 | Very high |
| Oct | 9 | Very high |
| Nov | 8 | Very high |
| Dec | 6 | High |
Air quality in Sơn La in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Sơn La is worst in April — around 151 µg/m³ PM2.5 (very unhealthy), about 12.9× the cleanest month (August, 12 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) | 32 | 38 | 67 | 151 | 58 | 14 | 12 | 12 | 16 | 23 | 26 | 31 |
| Level | Moderate | Poor | Unhealthy | Very unhealthy | Unhealthy | Moderate | Good | Good | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 32 | Moderate |
| Feb | 38 | Poor |
| Mar | 67 | Unhealthy |
| Apr | 151 | Very unhealthy |
| May | 58 | Unhealthy |
| Jun | 14 | Moderate |
| Jul | 12 | Good |
| Aug | 12 | Good |
| Sep | 16 | Moderate |
| Oct | 23 | Moderate |
| Nov | 26 | Moderate |
| Dec | 31 | Moderate |
Where is Sơn La?
Sơn La sits at 21.3°N, 103.9°E, 608 m above sea level, in Vietnam. The nearest listed city is Ít Ong, 24 km away.
Topography around Sơn La
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sơn La.
Within 3 km, the terrain around Sơn La has significant variations in elevation — a maximum elevation change of 348 m around an average of 674 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,404 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,830 m.
The land around Sơn La is covered by trees (59%) within 3 km, trees (69%) and grassland (21%) within 16 km, and trees (68%) and grassland (27%) 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 Sơn La (21.3256°, 103.9188°, elevation 608 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).