Oyem climate — normals and trends
Oyem (Gabon) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 22.8 °C and it receives 2,030 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 February (23.5 °C on average) and the coldest is July (22.0 °C). Rainfall peaks in October.
Oyem averages 0 frost days, 46 hot days (≥ 30 °C) and 282 rainy days per year.
Oyem has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The hottest day of the period reached 34.3 °C (on 26 March 2017) and the coldest 13.1 °C (on 29 August 1950).
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
OyemWoleu-Ntem Province
- coords
- 1.60°, 11.58°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
22.8°C
Average daily high
27.9°C
Average daily low
19.8°C
Annual rainfall
2,030mm
Sunshine / day
8.6h
Mean relative humidity
85%
Average peak wind
8.9km/h
Seasonal range
1.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
46 d/yr
Rainy days (≥ 1 mm)
282 d/yr
Annual snowfall
0.0 cm
Average feels-like high
31.9 °C
Average feels-like low
22.5 °C
Average peak gust
24.7 km/h
Tropical nights (≥ 20 °C)
155 d/yr
Solar radiation
15.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.80 · 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
34.3 °C
26 March 2017
Coldest day
13.1 °C
29 August 1950
Wettest day
165 mm
22 November 2023
Windiest day
17.3 km/h
16 July 1950
Strongest gust
53.6 km/h
5 December 1985
Hottest feels-like
41.4 °C
13 March 2024
Coldest feels-like
11.9 °C
6 August 1950
Sunniest day
12.0 h
17 October 1941
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 30.4 °C | +1.7 °C | 62 mm | -36 mm |
| Feb | 30.5 °C | +1.5 °C | 54 mm | -65 mm |
| Mar | 30.3 °C | +1.4 °C | 199 mm | -15 mm |
| Apr | 29.8 °C | +0.8 °C | 234 mm | +10 mm |
| May | 29.3 °C | +0.9 °C | 213 mm | +21 mm |
| Jun | 28.8 °C | +1.5 °C | 126 mm | -18 mm |
| Jul | 26.5 °C | +0.1 °C | 86 mm | -14 mm |
| Aug | 27.1 °C | +0.3 °C | 24 mm | -82 mm |
| Sep | 28.5 °C | +1.2 °C | 201 mm | -1 mm |
| Oct | 28.1 °C | +0.8 °C | 283 mm | +28 mm |
| Nov | 28.4 °C | +1.0 °C | 202 mm | -43 mm |
| Dec | 29.6 °C | +1.5 °C | 129 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 Oyem?
Oyem has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 22.8 °C and it receives 2,030 mm of precipitation per year.
What is the hottest day ever recorded in Oyem?
The hottest day measured in Oyem between 1940 and 2025 was 26 March 2017, reaching 34.3 °C.
What is the coldest day in Oyem?
The coldest day measured in Oyem between 1940 and 2025 was 29 August 1950, at 13.1 °C.
Does it snow in Oyem?
Almost never: Oyem sees virtually no snow, with about 0 frost days per year.
Has the climate of Oyem warmed?
Yes: Oyem warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Oyem?
The wettest day measured in Oyem between 1940 and 2025 was 22 November 2023, with 165 mm of rain in 24 hours.
What was the windiest day in Oyem?
The windiest day measured in Oyem between 1940 and 2025 was 16 July 1950, with winds reaching 17.3 km/h.
What is the warmest month in Oyem?
The warmest month in Oyem is February (23.5 °C on average); the coldest is July (22.0 °C).
How much does it rain in Oyem?
Oyem receives on average 2,030 mm of precipitation per year, spread over about 282 rainy days.
Is it sunny in Oyem?
Oyem gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
Are there tropical nights in Oyem?
Yes: Oyem has on average 155 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Oyem?
In Oyem, between 1940 and 2025, the highest apparent temperature reached 41.4 °C on 13 March 2024, and the lowest was 11.9 °C on 6 August 1950.
Compare Oyem with another city
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