Semi climate — normals and trends
Semi (Benin) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.5 °C and it receives 1,257 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 (27.8 °C on average) and the coldest is August (24.4 °C). Rainfall peaks in June.
Semi averages 0 frost days, 0 hot days (≥ 30 °C) and 214 rainy days per year.
Semi has warmed by +0.9 °C between 1940 and 2025, or +0.10 °C per decade. This trend is statistically significant.
The hottest day of the period reached 30.3 °C (on 5 May 2024) and the coldest 21.9 °C (on 9 January 1957).
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
SemiOuémé Department
- coords
- 6.37°, 2.62°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.5°C
Average daily high
27.1°C
Average daily low
25.8°C
Annual rainfall
1,257mm
Sunshine / day
10.4h
Mean relative humidity
84%
Average peak wind
23.5km/h
Seasonal range
3.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
214 d/yr
Annual snowfall
0.0 cm
Average feels-like high
31.2 °C
Average feels-like low
28.8 °C
Average peak gust
32.6 km/h
Tropical nights (≥ 20 °C)
365 d/yr
Solar radiation
17.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.9 °C
since 1940
+0.1 °C per decade · r² = 0.58 · 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
30.3 °C
5 May 2024
Coldest day
21.9 °C
9 January 1957
Wettest day
232 mm
8 September 1944
Windiest day
42.8 km/h
3 September 1973
Strongest gust
62.3 km/h
4 September 1973
Hottest feels-like
37.7 °C
19 March 2024
Coldest feels-like
17.9 °C
8 January 1957
Sunniest day
12.0 h
13 March 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 | 28.3 °C | +0.8 °C | 13 mm | -14 mm |
| Feb | 28.5 °C | +0.5 °C | 14 mm | -25 mm |
| Mar | 29.0 °C | +0.6 °C | 40 mm | -31 mm |
| Apr | 29.1 °C | +0.6 °C | 66 mm | -31 mm |
| May | 28.7 °C | +0.6 °C | 153 mm | -32 mm |
| Jun | 27.8 °C | +0.9 °C | 301 mm | +26 mm |
| Jul | 25.6 °C | +0.2 °C | 92 mm | -64 mm |
| Aug | 24.9 °C | +0.1 °C | 64 mm | -12 mm |
| Sep | 26.0 °C | +0.5 °C | 157 mm | +49 mm |
| Oct | 27.2 °C | +0.5 °C | 128 mm | +13 mm |
| Nov | 27.9 °C | +0.2 °C | 47 mm | -19 mm |
| Dec | 28.2 °C | +0.5 °C | 53 mm | +12 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 Semi?
Semi has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.5 °C and it receives 1,257 mm of precipitation per year.
What is the hottest day ever recorded in Semi?
The hottest day measured in Semi between 1940 and 2025 was 5 May 2024, reaching 30.3 °C.
What is the coldest day in Semi?
The coldest day measured in Semi between 1940 and 2025 was 9 January 1957, at 21.9 °C.
Does it snow in Semi?
Almost never: Semi sees virtually no snow, with about 0 frost days per year.
Has the climate of Semi warmed?
Yes: Semi warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Semi?
The wettest day measured in Semi between 1940 and 2025 was 8 September 1944, with 232 mm of rain in 24 hours.
What was the windiest day in Semi?
The windiest day measured in Semi between 1940 and 2025 was 3 September 1973, with winds reaching 42.8 km/h.
What is the warmest month in Semi?
The warmest month in Semi is March (27.8 °C on average); the coldest is August (24.4 °C).
How much does it rain in Semi?
Semi receives on average 1,257 mm of precipitation per year, spread over about 214 rainy days.
Is it sunny in Semi?
Semi gets on average 10.4 hours of sunshine per day, roughly 3,796 hours per year over 1940-2025.
Are there tropical nights in Semi?
Yes: Semi has on average 365 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Semi?
In Semi, between 1940 and 2025, the highest apparent temperature reached 37.7 °C on 19 March 2024, and the lowest was 17.9 °C on 8 January 1957.
Compare Semi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Semi