Climate averages 1991–2020
Sơn La weather
in May.
A hot, wet month: the warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Sơn La: daytime highs average 29.3°C and nights cool to about 21.3°C. By daytime temperature it is the warmest month of the year.
Expect about 147 mm of rain on roughly 19 days, which makes May a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 08 min on an average May day.
The nearest other city in this atlas is Thị Trấn Thuận Châu (27 km away). In May its highs average 29.7°C, about as warm as Sơn La, with 207 mm of rain.
Among the 136 cities listed in Vietnam, Sơn La ranks joint 124th of 136 for the warmest May highs and joint 23rd of 136 for the driest May (rainfall, lowest first). The mean May high of those 136 cities is 31.2°C; Sơn La is 1.9°C cooler than that mean.
From May to June, average highs fall by 0.6°C to 28.7°C, and monthly rainfall rises from 147 mm to 209 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sơn La climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 20.9°C12.3°C | 12.3°C | 24 | 4.0 | 11.011 h |
| February | 23.5°C13.8°C | 13.8°C | 20 | 3.7 | 11.411 h |
| March | 27.4°C16.9°C | 16.9°C | 50 | 7.1 | 12.012 h |
| April | 29.0°C19.5°C | 19.5°C | 72 | 12.7 | 12.613 h |
| May, selected | 29.3°C21.3°C | 21.3°C | 147 | 19.3 | 13.113 h |
| June | 28.7°C22.2°C | 22.2°C | 209 | 23.0 | 13.413 h |
| July | 28.1°C22.1°C | 22.1°C | 288 | 24.5 | 13.313 h |
| August | 28.0°C21.8°C | 21.8°C | 283 | 25.2 | 12.913 h |
| September | 27.4°C20.9°C | 20.9°C | 150 | 17.5 | 12.312 h |
| October | 25.9°C18.8°C | 18.8°C | 49 | 8.3 | 11.712 h |
| November | 23.8°C15.7°C | 15.7°C | 26 | 4.5 | 11.111 h |
| December | 21.0°C12.4°C | 12.4°C | 23 | 3.6 | 10.911 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Thị Trấn Thuận Châu in MayVietnam · 27 kmHigh 29.7°C · Low 21.6°C · 207 mm rain
- Dien Bien Phu in MayVietnam · 93 kmHigh 30.2°C · Low 22.1°C · 195 mm rain
- Yên Bái in MayVietnam · 112 kmHigh 30.0°C · Low 23.7°C · 294 mm rain
- Lào Cai in MayVietnam · 129 kmHigh 31.1°C · Low 23.5°C · 199 mm rain
- Phú Thọ in MayVietnam · 135 kmHigh 30.9°C · Low 24.1°C · 219 mm rain
- Tuyên Quang in MayVietnam · 145 kmHigh 30.9°C · Low 24.1°C · 251 mm rain
- Việt Trì in MayVietnam · 154 kmHigh 30.9°C · Low 24.2°C · 201 mm rain
- Ba Vì in MayVietnam · 154 kmHigh 29.0°C · Low 22.2°C · 244 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sơn La) is explained once on the Sơn La year overview and on the Sources, method and limits page.