São Tomé climate — normals and trends
São Tomé (São Tomé and Príncipe) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.4 °C and it receives 1,238 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is March (27.0 °C on average) and the coldest is July (23.5 °C). Rainfall peaks in November.
São Tomé averages 0 frost days, 0 hot days (≥ 30 °C) and 192 rainy days per year.
São Tomé has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The hottest day of the period reached 29.9 °C (on 27 March 2024) and the coldest 20.5 °C (on 31 July 1954).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
São ToméSão Tomé Island
- coords
- 0.34°, 6.73°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.4°C
Average daily high
26.0°C
Average daily low
24.8°C
Annual rainfall
1,238mm
Sunshine / day
10.0h
Mean relative humidity
83%
Average peak wind
20.5km/h
Seasonal range
3.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
192 d/yr
Annual snowfall
0.0 cm
Average feels-like high
29.8 °C
Average feels-like low
27.3 °C
Average peak gust
28.3 km/h
Tropical nights (≥ 20 °C)
365 d/yr
Solar radiation
18.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.66 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
29.9 °C
27 March 2024
Coldest day
20.5 °C
31 July 1954
Wettest day
236 mm
20 November 1993
Windiest day
43.7 km/h
10 August 1950
Strongest gust
61.6 km/h
10 August 1950
Hottest feels-like
37.2 °C
24 March 2024
Coldest feels-like
16.2 °C
10 August 1950
Sunniest day
11.8 h
27 January 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 27.7 °C | +0.8 °C | 87 mm | -64 mm |
| Feb | 28.3 °C | +0.9 °C | 61 mm | -66 mm |
| Mar | 28.3 °C | +0.6 °C | 123 mm | -16 mm |
| Apr | 28.1 °C | +0.5 °C | 58 mm | -71 mm |
| May | 27.1 °C | +0.4 °C | 102 mm | -7 mm |
| Jun | 25.8 °C | +1.0 °C | 14 mm | -3 mm |
| Jul | 24.4 °C | +0.6 °C | 8 mm | +3 mm |
| Aug | 23.6 °C | -0.4 °C | 4 mm | -4 mm |
| Sep | 25.0 °C | +0.3 °C | 15 mm | -21 mm |
| Oct | 25.7 °C | +0.2 °C | 97 mm | -33 mm |
| Nov | 26.4 °C | +0.3 °C | 136 mm | -60 mm |
| Dec | 26.9 °C | +0.4 °C | 196 mm | +4 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of São Tomé?
São Tomé has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.4 °C and it receives 1,238 mm of precipitation per year.
What is the hottest day ever recorded in São Tomé?
The hottest day measured in São Tomé between 1940 and 2025 was 27 March 2024, reaching 29.9 °C.
What is the coldest day in São Tomé?
The coldest day measured in São Tomé between 1940 and 2025 was 31 July 1954, at 20.5 °C.
Does it snow in São Tomé?
Almost never: São Tomé sees virtually no snow, with about 0 frost days per year.
Has the climate of São Tomé warmed?
Yes: São Tomé warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in São Tomé?
The wettest day measured in São Tomé between 1940 and 2025 was 20 November 1993, with 236 mm of rain in 24 hours.
What was the windiest day in São Tomé?
The windiest day measured in São Tomé between 1940 and 2025 was 10 August 1950, with winds reaching 43.7 km/h.
What is the warmest month in São Tomé?
The warmest month in São Tomé is March (27.0 °C on average); the coldest is July (23.5 °C).
How much does it rain in São Tomé?
São Tomé receives on average 1,238 mm of precipitation per year, spread over about 192 rainy days.
Is it sunny in São Tomé?
São Tomé gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.
Are there tropical nights in São Tomé?
Yes: São Tomé has on average 365 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in São Tomé?
In São Tomé, between 1940 and 2025, the highest apparent temperature reached 37.2 °C on 24 March 2024, and the lowest was 16.2 °C on 10 August 1950.
Compare São Tomé with another city
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