Sao Tome weather by month
Sao Tome runs from about 25°C in August to 28°C in April, with February the wettest month at 379 mm.
warmest month
April
28°C
coolest month
August
25°C
wettest month
February
379 mm
worst air month
June
15 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 27°C | 149 mm | 301 h | 8 |
| February | 28°C | 379 mm | 254 h | 8 |
| March | 28°C | 283 mm | 242 h | 10 |
| April | 28°C | 219 mm | 255 h | 5 |
| May | 28°C | 321 mm | 220 h | 10 |
| June | 26°C | 52 mm | 292 h | 15 |
| July | 25°C | 69 mm | 269 h | 14 |
| August | 25°C | 117 mm | 268 h | 12 |
| September | 26°C | 330 mm | 217 h | 9 |
| October | 26°C | 294 mm | 247 h | 7 |
| November | 26°C | 310 mm | 228 h | 7 |
| December | 26°C | 285 mm | 272 h | 7 |
About 3,065 hours of sun a year. Roughly 267 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.