nomadseason

Monthly climate in Bissau, Guinea-Bissau

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Bissau features a tropical savanna climate (Aw). Temperatures typically range between 26 °C (80 °F) and 29 °C (84 °F) through the year, but rarely can drop to 17 °C (64 °F) or can rise to as high as 41 °C (106 °F). The average annual precipitation amounts to about 1572 mm (61.9 inches) and receives 117 rainy days on the 1 mm (0.04 inches) threshold annually. Bissau enjoys an average of 3543 hours of sunshine throughout the year, and daylight varies from 11 hours 25 minutes to 12 hours 47 minutes per day.

Monthly average temperatures in Bissau, Guinea-Bissau

The warmest months in Bissau are April, June and November, with daily mean temperatures ranging from 28 to 29 °C (84 - 84 °F) throughout the day. The coldest temperatures usually occur in January, August and December, when daily mean temperatures range from 26 to 27 °C (80 - 81 °F) throughout the day. On average each year, Bissau experiences 329 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 Bissau. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum38°C
(100°F)		39°C
(102°F)		40°C
(104°F)		41°C
(106°F)		40°C
(104°F)		37°C
(98°F)		33°C
(92°F)		32°C
(90°F)		34°C
(94°F)		35°C
(96°F)		37°C
(100°F)		37°C
(99°F)
Mean maximum37°C
(98°F)		38°C
(100°F)		39°C
(103°F)		39°C
(102°F)		38°C
(100°F)		35°C
(94°F)		32°C
(90°F)		32°C
(89°F)		33°C
(92°F)		34°C
(93°F)		36°C
(96°F)		36°C
(98°F)
Average high34°C
(93°F)		35°C
(95°F)		35°C
(96°F)		35°C
(96°F)		34°C
(93°F)		32°C
(90°F)		30°C
(86°F)		29°C
(85°F)		30°C
(87°F)		32°C
(90°F)		33°C
(92°F)		34°C
(93°F)
Daily mean26°C
(80°F)		27°C
(82°F)		28°C
(83°F)		29°C
(84°F)		28°C
(84°F)		28°C
(84°F)		27°C
(81°F)		27°C
(80°F)		27°C
(81°F)		28°C
(83°F)		29°C
(84°F)		27°C
(81°F)
Average low20°C
(69°F)		22°C
(71°F)		23°C
(73°F)		24°C
(75°F)		25°C
(76°F)		26°C
(78°F)		25°C
(77°F)		25°C
(77°F)		25°C
(77°F)		25°C
(78°F)		25°C
(77°F)		22°C
(71°F)
Mean minimum18°C
(64°F)		19°C
(67°F)		21°C
(70°F)		22°C
(72°F)		23°C
(74°F)		24°C
(75°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		22°C
(73°F)		19°C
(66°F)
Minimum17°C
(64°F)		19°C
(66°F)		20°C
(69°F)		21°C
(70°F)		22°C
(71°F)		22°C
(73°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		20°C
(68°F)		18°C
(64°F)

Compare climate in Bissau with other places

Compare temperature, precipitation, sunshine, UV index in Bissau, Guinea-Bissau with other places around the world.

Monthly average precipitation in Bissau, Guinea-Bissau

Bissau usually has the most precipitation in July, August and September, with an average of 28 rainy days and 453 mm (17.9 inches) of precipitation per month. The driest months in Bissau are January, February and March. On average, 0 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bissau. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)0 (0.0)0 (0.0)0 (0.0)0 (0.0)1 (0.1)52 (2.0)453 (17.8)539 (21.2)369 (14.5)134 (5.3)24 (0.9)0 (0.0)
Average precipitation days (≥ 1 mm)0000092929261950

Monthly sunshine hours in Bissau, Guinea-Bissau

The sunniest months in Bissau are March, April and May, when the sun shines an average of 10 hours 56 minutes a day. Least sunny months in Bissau: January, August and September receive an average of 8 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bissau. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours258289334331340297268239258298305321
Mean daily daylight hours11h 30m11h 44m12h 3m12h 23m12h 39m12h 47m12h 43m12h 29m12h 10m11h 50m11h 33m11h 25m

Solar UV radiation in Bissau, Guinea-Bissau

Bissau experiences the highest level of ultraviolet (UV) radiation in May, August and September, when the maximum UV index can reach values of 13 - 14, which corresponds to the Extreme category of sun exposure. February, November and December are in the Very High exposure category. In these months, the maximum values of the UV index do not exceed 10. For more detailed information, check out our hourly Bissau UV Index data.

Average daily maximum UV levels by month for Bissau. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)1010111213131314141299