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Monthly climate in Oyem, Gabon

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Oyem features a tropical monsoon climate (Am). Temperatures typically range between 23 °C (74 °F) and 25 °C (77 °F) through the year, but rarely can drop to 18 °C (65 °F) or can rise to as high as 34 °C (94 °F). The average annual precipitation amounts to about 2284 mm (89.9 inches) and receives 292 rainy days on the 1 mm (0.04 inches) threshold annually. Oyem enjoys an average of 3282 hours of sunshine throughout the year, and daylight varies from 12 hours 1 minutes to 12 hours 12 minutes per day.

Monthly average temperatures in Oyem, Gabon

The warmest months in Oyem are January, February and April, with daily mean temperatures ranging from 25 to 25 °C (76 - 77 °F) throughout the day. The coldest temperatures usually occur in July, August and September, when daily mean temperatures range from 23 to 24 °C (74 - 75 °F) throughout the day. On average each year, Oyem experiences 325 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Oyem. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum32°C
(90°F)		33°C
(91°F)		34°C
(94°F)		33°C
(92°F)		32°C
(90°F)		31°C
(89°F)		30°C
(86°F)		30°C
(87°F)		32°C
(89°F)		32°C
(90°F)		32°C
(91°F)		32°C
(90°F)
Mean maximum32°C
(89°F)		32°C
(90°F)		33°C
(91°F)		33°C
(91°F)		32°C
(90°F)		30°C
(87°F)		29°C
(85°F)		29°C
(85°F)		31°C
(88°F)		31°C
(88°F)		31°C
(88°F)		31°C
(89°F)
Average high30°C
(86°F)		30°C
(87°F)		30°C
(86°F)		30°C
(86°F)		29°C
(85°F)		29°C
(84°F)		27°C
(82°F)		28°C
(82°F)		28°C
(83°F)		28°C
(83°F)		29°C
(84°F)		29°C
(85°F)
Daily mean25°C
(77°F)		25°C
(77°F)		25°C
(76°F)		25°C
(76°F)		24°C
(76°F)		24°C
(75°F)		23°C
(74°F)		23°C
(74°F)		24°C
(75°F)		24°C
(75°F)		24°C
(75°F)		24°C
(76°F)
Average low21°C
(70°F)		21°C
(70°F)		21°C
(70°F)		21°C
(70°F)		21°C
(70°F)		21°C
(69°F)		21°C
(69°F)		20°C
(69°F)		20°C
(69°F)		20°C
(69°F)		20°C
(69°F)		21°C
(70°F)
Mean minimum19°C
(67°F)		20°C
(67°F)		19°C
(66°F)		20°C
(68°F)		19°C
(67°F)		19°C
(67°F)		19°C
(67°F)		19°C
(66°F)		20°C
(68°F)		19°C
(67°F)		19°C
(67°F)		20°C
(68°F)
Minimum18°C
(65°F)		19°C
(66°F)		18°C
(65°F)		19°C
(67°F)		18°C
(65°F)		19°C
(66°F)		19°C
(67°F)		19°C
(66°F)		19°C
(67°F)		19°C
(66°F)		19°C
(66°F)		19°C
(67°F)

Compare climate in Oyem with other places

Compare temperature, precipitation, sunshine, UV index in Oyem, Gabon with other places around the world.

Monthly average precipitation in Oyem, Gabon

Oyem usually has the most precipitation in April, October and November, with an average of 27 rainy days and 272 mm (10.7 inches) of precipitation per month. The driest months in Oyem are January, February and December. On average, 112 mm (4.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oyem. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)78 (3.1)124 (4.9)227 (8.9)249 (9.8)224 (8.8)158 (6.2)141 (5.6)136 (5.3)245 (9.6)292 (11.5)276 (10.9)134 (5.3)
Average precipitation days (≥ 1 mm)171926262825222228282724

Monthly sunshine hours in Oyem, Gabon

The sunniest months in Oyem are April, May and June, when the sun shines an average of 9 hours 29 minutes a day. Least sunny months in Oyem: January, February and September receive an average of 8 hours 31 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oyem. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours243260285287287288272275262269269278
Mean daily daylight hours12h 1m12h 3m12h 5m12h 8m12h 10m12h 12m12h 11m12h 8m12h 6m12h 3m12h 2m12h 1m

Solar UV radiation in Oyem, Gabon

Oyem experiences the highest level of ultraviolet (UV) radiation in March, April and October, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure. June, July and December are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 11. For more detailed information, check out our hourly Oyem UV Index data.

Average daily maximum UV levels by month for Oyem. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)121214151311111213141211