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Sơn La, Vietnam climate
Cwa Monsoon-influenced humid subtropical
Sơn La has a mildly seasonal warm-temperate climate (Monsoon-influenced humid subtropical, Köppen Cwa). The hottest month is June with an average daily high near 86°F, while the coldest is January averaging around 52°F at night. Precipitation totals about 49 inches a year and is strongly seasonal — August alone averages 9.5 inches while February barely receives 0.76 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Sơn La climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 70 | 75 | 81 | 85 | 87 | 86 | 86 | 86 | 85 | 82 | 77 | 71 |
| Avg temp (°F) | 61 | 65 | 71 | 75 | 78 | 79 | 79 | 79 | 77 | 74 | 68 | 62 |
| Avg low (°F) | 52 | 55 | 61 | 66 | 70 | 72 | 72 | 72 | 69 | 65 | 58 | 53 |
| Precipitation (in) | 1.4 | 0.8 | 1.8 | 4.2 | 6.3 | 6.8 | 9.5 | 9.5 | 4.4 | 2.0 | 1.2 | 1.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 70 | 75 | 81 | 85 | 87 | 86 |
| Avg temp (°F) | 61 | 65 | 71 | 75 | 78 | 79 |
| Avg low (°F) | 52 | 55 | 61 | 66 | 70 | 72 |
| Precipitation (in) | 1.4 | 0.8 | 1.8 | 4.2 | 6.3 | 6.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 86 | 86 | 85 | 82 | 77 | 71 |
| Avg temp (°F) | 79 | 79 | 77 | 74 | 68 | 62 |
| Avg low (°F) | 72 | 72 | 69 | 65 | 58 | 53 |
| Precipitation (in) | 9.5 | 9.5 | 4.4 | 2.0 | 1.2 | 1.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 45 | 48 | 60 | 76 | 89 | 90 | 85 | 71 | 61 | 49 | 52 |
| Relative humidity (%) | 78 | 72 | 69 | 70 | 74 | 79 | 82 | 83 | 81 | 82 | 80 | 79 |
| Wind speed (mph) | 1.1 | 1.3 | 1.3 | 1.3 | 1.1 | 0.9 | 0.9 | 0.9 | 0.9 | 1.0 | 1.1 | 1.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 45 | 48 | 60 | 76 | 89 |
| Relative humidity (%) | 78 | 72 | 69 | 70 | 74 | 79 |
| Wind speed (mph) | 1.1 | 1.3 | 1.3 | 1.3 | 1.1 | 0.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 90 | 85 | 71 | 61 | 49 | 52 |
| Relative humidity (%) | 82 | 83 | 81 | 82 | 80 | 79 |
| Wind speed (mph) | 0.9 | 0.9 | 0.9 | 1.0 | 1.1 | 1.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 24 years of daily observations at Son LA, a weather station, about 2 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.