Bissau, Guinea-Bissau Climate & Monthly Averages
The climate of Bissau
Bissau has a tropical wet-and-dry climate, marked by year-round warmth split between a rainy season and a pronounced dry season. Average daytime highs range from about 83°F (28°C) in August to around 88°F (31°C) in June, and the city records roughly 117 days of measurable precipitation a year.
Climate quick facts
- Hottest month: June - highs near 88°F (31°C)
- Coldest month: August - highs near 83°F (28°C)
- Record high: 105°F (40°C) · Record low: 65°F (18°C) (2015–2024)
- Wettest month: August (29 rainy days) · Sunniest: April (11.7 h sun/day)
- Climate type: tropical wet-and-dry - year-round warmth split between a rainy season and a pronounced dry season
Temperatures through the year
The warmest stretch of the year centers on June. Highs average 88°F (31°C) and overnight lows stay near 78°F (25°C). The coolest month is August, with typical highs of 83°F (28°C) and lows around 76°F (25°C). Based on 2015–2024 weather data, temperatures have reached as high as 105°F (40°C) and dropped as low as 65°F (18°C).
Rain, sun and snow
August is usually the wettest month. It brings about 19.9 inches (506 mm) of rain over 29 days, while January is the driest. April brings the most sunshine, averaging 11.7 hours of sun a day.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 91° | 70° | 0 | 0.0 in | 10.5 h/day | 43% |
| February | 93° | 71° | 0 | 0.0 in | 10.8 h/day | 44% |
| March | 93° | 73° | 0 | 0.0 in | 11.2 h/day | 52% |
| April | 91° | 74° | 0 | 0.0 in | 11.7 h/day | 60% |
| May | 90° | 75° | 1 | 0.1 in | 11.2 h/day | 66% |
| June | 88° | 78° | 10 | 2.4 in | 10.2 h/day | 76% |
| July | 83° | 77° | 28 | 16.5 in | 7.8 h/day | 85% |
| August | 83° | 76° | 29 | 19.9 in | 7.5 h/day | 87% |
| September | 84° | 76° | 26 | 13.2 in | 8.2 h/day | 87% |
| October | 87° | 77° | 20 | 5.7 in | 9.7 h/day | 85% |
| November | 89° | 75° | 4 | 0.7 in | 10.4 h/day | 72% |
| December | 91° | 71° | 0 | 0.0 in | 10.1 h/day | 49% |
Bissau month by month
Bissau weather in January
January brings highs around 91°F (33°C), lows near 70°F (21°C), about 0 wet days - typically the driest month of the year in Bissau.
Bissau weather in February
February brings highs around 93°F (34°C), lows near 71°F (22°C), about 0 wet days.
Bissau weather in March
March brings highs around 93°F (34°C), lows near 73°F (23°C), about 0 wet days.
Bissau weather in April
April brings highs around 91°F (33°C), lows near 74°F (23°C), about 0 wet days - typically the sunniest month of the year in Bissau.
Bissau weather in May
May brings highs around 90°F (32°C), lows near 75°F (24°C), about 1 wet days.
Bissau weather in June
June brings highs around 88°F (31°C), lows near 78°F (25°C), about 10 wet days - typically the hottest month of the year in Bissau.
Bissau weather in July
July brings highs around 83°F (29°C), lows near 77°F (25°C), about 28 wet days.
Bissau weather in August
August brings highs around 83°F (28°C), lows near 76°F (25°C), about 29 wet days - typically the coldest month and the wettest month of the year in Bissau.
Bissau weather in September
September brings highs around 84°F (29°C), lows near 76°F (25°C), about 26 wet days.
Bissau weather in October
October brings highs around 87°F (30°C), lows near 77°F (25°C), about 20 wet days.
Bissau weather in November
November brings highs around 89°F (32°C), lows near 75°F (24°C), about 4 wet days.
Bissau weather in December
December brings highs around 91°F (33°C), lows near 71°F (22°C), about 0 wet days.
Seasons in Bissau
March through May
March through May in Bissau brings hot afternoons, with daytime highs averaging 91°F (33°C) and nights around 74°F (23°C); precipitation is infrequent.
June through August
June through August in Bissau runs hot, with daytime highs averaging 85°F (29°C) and nights around 77°F (25°C); expect showers on roughly 66 days across the season.
September through November
September through November in Bissau is hot, with daytime highs averaging 87°F (30°C) and nights around 76°F (25°C); expect showers on roughly 50 days across the season.
December through February
December through February in Bissau brings serious heat, with daytime highs averaging 92°F (33°C) and nights around 71°F (22°C); precipitation is infrequent.
Climate questions, answered
What is the average temperature in Bissau?
Is Bissau hot in summer?
Is Bissau cold in winter?
How many rainy days does Bissau get in a year?
Best time to visit Bissau
The best time to visit Bissau is generally November to January and April to May, when these months combine the driest skies with the most comfortable heat. Daytime temperatures in that window typically sit near 91°F (33°C).
Pack for Bissau with lightweight, breathable clothing and strong sun protection for the hot months; a compact umbrella or rain shell - showers are a regular feature. Evenings can feel noticeably cooler than afternoons - June nights average 78°F (25°C).
Bissau temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.