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São Tomé, São Tomé and Príncipe climate
Aw Tropical savanna (dry winter)
São Tomé has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is March with an average daily high near 28°C, while the coldest is July averaging around 24°C at night. Precipitation totals about 1412 mm a year and is strongly seasonal — November alone averages 225 mm while July barely receives 18 mm.
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)São Tomé climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 28 | 28 | 28 | 27 | 26 | 25 | 25 | 26 | 27 | 27 | 27 |
| Avg temp (°C) | 27 | 27 | 28 | 27 | 27 | 25 | 25 | 25 | 25 | 26 | 26 | 27 |
| Avg low (°C) | 27 | 27 | 27 | 27 | 27 | 25 | 24 | 24 | 25 | 26 | 26 | 26 |
| Precipitation (mm) | 146 | 125 | 144 | 143 | 137 | 33 | 18 | 25 | 60 | 172 | 225 | 186 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 28 | 28 | 28 | 27 | 26 |
| Avg temp (°C) | 27 | 27 | 28 | 27 | 27 | 25 |
| Avg low (°C) | 27 | 27 | 27 | 27 | 27 | 25 |
| Precipitation (mm) | 146 | 125 | 144 | 143 | 137 | 33 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 26 | 27 | 27 | 27 |
| Avg temp (°C) | 25 | 25 | 25 | 26 | 26 | 27 |
| Avg low (°C) | 24 | 24 | 25 | 26 | 26 | 26 |
| Precipitation (mm) | 18 | 25 | 60 | 172 | 225 | 186 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 73 | 77 | 77 | 72 | 68 | 71 | 73 | 75 | 75 | 72 | 69 |
| Relative humidity (%) | 83 | 83 | 83 | 83 | 85 | 83 | 82 | 82 | 82 | 83 | 85 | 84 |
| Wind speed (mph) | 7.1 | 7.7 | 7.8 | 7.7 | 8.1 | 9.6 | 9.6 | 9.5 | 9.3 | 8.7 | 8.1 | 7.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 73 | 77 | 77 | 72 | 68 |
| Relative humidity (%) | 83 | 83 | 83 | 83 | 85 | 83 |
| Wind speed (mph) | 7.1 | 7.7 | 7.8 | 7.7 | 8.1 | 9.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 73 | 75 | 75 | 72 | 69 |
| Relative humidity (%) | 82 | 82 | 82 | 83 | 85 | 84 |
| Wind speed (mph) | 9.6 | 9.5 | 9.3 | 8.7 | 8.1 | 7.2 |
Methodology & sources
Temperature & precipitation — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
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.