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Santo António, São Tomé and Príncipe climate
Af Tropical rainforest
Santo António has a remarkably steady tropical climate (Tropical rainforest, Köppen Af). The hottest month is March with an average daily high near 28°C, while the coldest is August averaging around 25°C at night. Around 1796 mm of precipitation falls each year, peaking in October (250 mm) and easing off in July (78 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)Santo António climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 28 | 28 | 28 | 26 | 26 | 25 | 26 | 26 | 27 | 27 |
| Avg temp (°C) | 27 | 28 | 28 | 28 | 27 | 26 | 25 | 25 | 26 | 26 | 26 | 27 |
| Avg low (°C) | 27 | 27 | 28 | 27 | 27 | 26 | 25 | 25 | 25 | 26 | 26 | 27 |
| Precipitation (mm) | 111 | 112 | 149 | 161 | 187 | 127 | 78 | 85 | 164 | 250 | 236 | 138 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 28 | 28 | 28 | 26 |
| Avg temp (°C) | 27 | 28 | 28 | 28 | 27 | 26 |
| Avg low (°C) | 27 | 27 | 28 | 27 | 27 | 26 |
| Precipitation (mm) | 111 | 112 | 149 | 161 | 187 | 127 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 25 | 26 | 26 | 27 | 27 |
| Avg temp (°C) | 25 | 25 | 26 | 26 | 26 | 27 |
| Avg low (°C) | 25 | 25 | 25 | 26 | 26 | 27 |
| Precipitation (mm) | 78 | 85 | 164 | 250 | 236 | 138 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 74 | 79 | 78 | 77 | 78 | 81 | 81 | 81 | 79 | 72 | 67 |
| Relative humidity (%) | 83 | 83 | 83 | 84 | 85 | 83 | 82 | 83 | 84 | 85 | 86 | 84 |
| Wind speed (km/h) | 12.2 | 13.1 | 13.2 | 13.0 | 13.5 | 16.5 | 16.8 | 16.5 | 15.6 | 14.1 | 13.0 | 12.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 74 | 79 | 78 | 77 | 78 |
| Relative humidity (%) | 83 | 83 | 83 | 84 | 85 | 83 |
| Wind speed (km/h) | 12.2 | 13.1 | 13.2 | 13.0 | 13.5 | 16.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 81 | 81 | 79 | 72 | 67 |
| Relative humidity (%) | 82 | 83 | 84 | 85 | 86 | 84 |
| Wind speed (km/h) | 16.8 | 16.5 | 15.6 | 14.1 | 13.0 | 12.3 |
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.