Bissau, Guinea-Bissau Weather
Bissau hourly forecast: next 24 hours
Today's high of 84°F (29°C) is right in line with the typical September high of 84°F (29°C).
Current conditions in detail
Bissau weather tomorrow (Wednesday, September 16)
Tomorrow in Bissau looks overcast, with a high of 83° and an overnight low of 81°. There is a 41% chance of rain - plan accordingly. Winds top out near 14 mph, and the UV index reaches 8 (very high).
Bissau 14-day forecast
About the weather in Bissau
Bissau has one of the steadier climates in our dataset. Average highs move only 2°C across the whole year - from 83°F (28°C) in August to 88°F (31°C) in June - so the practical difference between seasons here is rainfall and daylight, not warmth.
Bissau weather: quick facts
- Hottest month: June - highs near 88°F (31°C)
- Coldest month: August - highs near 83°F (28°C)
- Decade extremes (2015-2024): 105°F (40°C) high · 65°F (18°C) low
- Wettest month: August (29 rainy days) · Sunniest: April (11.7 h sun/day)
- Climate type: tropical wet-and-dry
- Annual swing: 2°C between the average warmest and coolest month · day to night: 8°C
- Months averaging 30°C or hotter: 9
- Average humidity: 67%
Temperatures through the year
7 months average under 20 mm of rain, the longest unbroken stretch running November through May. August sits at the other end of the year: 83°F (28°C) by day, 76°F (25°C) at night. Warmth peaks in June: highs of 88°F (31°C), lows of 78°F (25°C). The gridded 2015-2024 daily record for this location tops out at 105°F (40°C) and bottoms at 65°F (18°C) - decade extremes, not all-time station records. Relative humidity averages 67% across the year, drier than about 75% of the cities we track.
Rain, sun and snow
April is the brightest month at 11.7 hours of sun a day, against an annual average of 9.9. Rainfall is strongly seasonal: 85% of the annual total falls in the July to September window, leaving January at less than 1 mm. Between the average June and the average August lie 2°C, a narrower spread than all but 3% of the 3496 cities in our dataset.
Season by season
March through May
March through May in Bissau is hot, with daytime highs averaging 91°F (33°C) and nights around 74°F (23°C); precipitation is essentially absent. Daylight is generous - around 11.4 hours of sun a day.
June through August
Through June through August, Bissau brings hot afternoons: 85°F (29°C) by day, 77°F (25°C) after dark, and rain falls on around 66 of the 90 days.
September through November
September through November in Bissau runs hot, with daytime highs averaging 87°F (30°C) and nights around 76°F (25°C); rain falls on around 50 of the 90 days.
December through February
Through December through February, Bissau brings serious heat: 92°F (33°C) by day, 71°F (22°C) after dark, and precipitation is essentially absent. Daylight is generous - around 10.5 hours of sun a day.
Average temperatures in Bissau by month
| 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% |