Oyem, Gabon climate

Af Tropical rainforest

Oyem has a remarkably steady warm-temperate climate (Tropical rainforest, Köppen Af). The hottest month is February with an average daily high near 29°C, while the coldest is October averaging around 20°C at night. Around 2061 mm of precipitation falls each year, peaking in October (261 mm) and easing off in January (84 mm).

☀️ All year

Warm

Daytime highs near 29°C most of the year.

About 8 days a year above 32 °C

🌙 Nights

Stays warm

Even the coolest nights stay near 20°C.

🌧️ Rain

Very wet

About 2061 mm of rain a year.

Wettest in October

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Oyem climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	29	29	28	27	27	27	27	27	27	26	27	28
Avg temp (°C)	24	25	25	24	24	24	23	23	23	23	23	24
Avg low (°C)	20	21	21	21	21	20	20	20	20	20	20	20
Precipitation (mm)	84	112	200	229	191	156	134	130	225	261	227	113

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	29	29	28	27	27	27
Avg temp (°C)	24	25	25	24	24	24
Avg low (°C)	20	21	21	21	21	20
Precipitation (mm)	84	112	200	229	191	156

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	27	27	27	26	27	28
Avg temp (°C)	23	23	23	23	23	24
Avg low (°C)	20	20	20	20	20	20
Precipitation (mm)	134	130	225	261	227	113

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with high ≥ 32°C (days)	2	2	0.7	0.3	0.5	0.5	0.2	0.3	0.1	—	—	0.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with high ≥ 32°C (days)	2	2	0.7	0.3	0.5	0.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with high ≥ 32°C (days)	0.2	0.3	0.1	—	—	0.4

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	71	75	80	80	78	78	79	81	83	85	82	72
Relative humidity (%)	82	84	88	90	90	87	86	85	88	91	90	85
Wind speed (km/h)	0.3	0.2	0.3	0.3	0.4	0.3	0.2	0.1	0.3	0.4	0.4	0.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	71	75	80	80	78	78
Relative humidity (%)	82	84	88	90	90	87
Wind speed (km/h)	0.3	0.2	0.3	0.3	0.4	0.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	79	81	83	85	82	72
Relative humidity (%)	86	85	88	91	90	85
Wind speed (km/h)	0.2	0.1	0.3	0.4	0.4	0.4

Methodology & sources

Temperature & precipitation — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →