Sao Tome, Sao Tome and Principe Weather
Sao Tome hourly forecast: next 24 hours
Today's high of 77°F (25°C) is about 4°F (2°C) below the typical September high of 81°F (27°C).
Current conditions in detail
Sao Tome weather tomorrow (Thursday, September 17)
Tomorrow in Sao Tome looks patchy rain nearby, with a high of 75° and an overnight low of 74°. There is a 61% chance of rain - plan accordingly. Winds top out near 7 mph, and the UV index reaches 5 (moderate).
Sao Tome 14-day forecast
About the weather in Sao Tome
Sao Tome has one of the steadier climates in our dataset. Average highs move only 2°C across the whole year - from 80°F (27°C) in August to 85°F (29°C) in March - so the practical difference between seasons here is rainfall and daylight, not warmth.
Sao Tome weather: quick facts
- Hottest month: March - highs near 85°F (29°C)
- Coldest month: August - highs near 80°F (27°C)
- Decade extremes (2015-2024): 90°F (32°C) high · 68°F (20°C) low
- Wettest month: October (27 rainy days) · Sunniest: June (9.6 h sun/day)
- Climate type: tropical wet-and-dry
- Annual swing: 2°C between the average warmest and coolest month · day to night: 4°C
- Average humidity: 86%
Temperatures through the year
Warmth peaks in March: highs of 85°F (29°C), lows of 78°F (26°C). August is the coolest month, with highs of 80°F (27°C) and lows near 74°F (23°C). Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 90°F (32°C) and the lowest daily minimum 68°F (20°C). Between the average March and the average August lie 2°C, a narrower spread than all but 6% of the 3496 cities in our dataset.
Rain, sun and snow
Relative humidity averages 86% across the year, more humid than almost anywhere else we cover - enough that summer afternoons feel hotter than the thermometer says, which is what the dew point converter is for. Precipitation concentrates in October - 15.6 inches (396 mm) on 27 days - and thins out by July. Sunshine averages 8.8 hours a day over the year, peaking in June at 9.6 hours. Days and nights are about 4°C apart on average - narrower than almost anywhere else we cover.
Season by season
March through May
March through May runs hot here - highs near 84°F (29°C), nights near 78°F (25°C), and rain falls on around 71 of the 90 days.
June through August
Through June through August, Sao Tome runs hot: 81°F (27°C) by day, 74°F (24°C) after dark, and rain falls on around 46 of the 90 days.
September through November
September through November brings hot afternoons here - highs near 81°F (27°C), nights near 76°F (24°C), and rain falls on around 77 of the 90 days.
December through February
December through February in Sao Tome is hot, with daytime highs averaging 83°F (28°C) and nights around 77°F (25°C); rain falls on around 78 of the 90 days.
Average temperatures in Sao Tome by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 83° | 77° | 26 | 9.0 in | 9.4 h/day | 87% |
| February | 84° | 78° | 24 | 8.2 in | 9.4 h/day | 86% |
| March | 85° | 78° | 24 | 9.7 in | 8.6 h/day | 86% |
| April | 85° | 78° | 24 | 9.1 in | 8.8 h/day | 86% |
| May | 83° | 78° | 23 | 8.8 in | 8.6 h/day | 86% |
| June | 82° | 75° | 13 | 2.9 in | 9.6 h/day | 84% |
| July | 81° | 74° | 14 | 2.3 in | 9.2 h/day | 83% |
| August | 80° | 74° | 19 | 4.8 in | 8.5 h/day | 84% |
| September | 81° | 75° | 24 | 9.2 in | 8.4 h/day | 86% |
| October | 81° | 76° | 27 | 15.6 in | 8.3 h/day | 88% |
| November | 82° | 76° | 26 | 13.3 in | 8.6 h/day | 88% |
| December | 82° | 77° | 28 | 11.8 in | 8.8 h/day | 88% |