Climate averages 1991–2020
São Tomé weather
in May.
A warm, wet month: the 5th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in São Tomé: daytime highs average 26.8°C and nights cool to about 25.2°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 119 mm of rain on roughly 17 days, which makes May a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 08 min on an average May day.
The nearest other city in this atlas is Port-Gentil (257 km away). In May its highs average 28.4°C, 1.6°C warmer than São Tomé, with 110 mm of rain.
From May to June, average highs fall by 1.3°C to 25.5°C, and monthly rainfall falls from 119 mm to 23 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
São Tomé climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.9°C24.9°C | 24.9°C | 135 | 23.6 | 12.112 h |
| February | 27.5°C25.4°C | 25.4°C | 115 | 19.4 | 12.112 h |
| March | 27.8°C25.7°C | 25.7°C | 133 | 20.5 | 12.112 h |
| April | 27.6°C25.7°C | 25.7°C | 130 | 18.7 | 12.112 h |
| May, selected | 26.8°C25.2°C | 25.2°C | 119 | 17.0 | 12.112 h |
| June | 25.5°C24.1°C | 24.1°C | 23 | 4.0 | 12.112 h |
| July | 24.9°C23.3°C | 23.3°C | 7.7 | 2.0 | 12.112 h |
| August | 25.0°C23.3°C | 23.3°C | 14 | 2.6 | 12.112 h |
| September | 25.5°C23.8°C | 23.8°C | 46 | 7.8 | 12.112 h |
| October | 25.8°C24.2°C | 24.2°C | 152 | 21.5 | 12.112 h |
| November | 26.1°C24.4°C | 24.4°C | 210 | 25.7 | 12.112 h |
| December | 26.5°C24.6°C | 24.6°C | 174 | 26.1 | 12.112 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
- Port-Gentil in MayGabon · 257 kmHigh 28.4°C · Low 24.5°C · 110 mm rain
- Libreville in MayGabon · 303 kmHigh 28.8°C · Low 24.4°C · 244 mm rain
- Owendo in MayGabon · 309 kmHigh 29.4°C · Low 24.0°C · 224 mm rain
- Bata in MayEquatorial Guinea · 378 kmHigh 28.7°C · Low 23.9°C · 265 mm rain
- Malabo in MayEquatorial Guinea · 443 kmHigh 28.5°C · Low 25.7°C · 273 mm rain
- Kribi in MayCameroon · 456 kmHigh 28.0°C · Low 24.4°C · 281 mm rain
- Ciudad de la Paz in MayEquatorial Guinea · 476 kmHigh 28.0°C · Low 20.6°C · 241 mm rain
- Ogbia in MayNigeria · 486 kmHigh 29.7°C · Low 24.1°C · 312 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 São Tomé) is explained once on the São Tomé year overview and on the Sources, method and limits page.