Climate averages 1991–2020
Bissau weather
in August.
A hot, very wet month: the coolest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Bissau: daytime highs average 28.3°C and nights cool to about 24.3°C. By daytime temperature it is the coolest month of the year.
Expect about 452 mm of rain on roughly 29 days, which makes August a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 31 min on an average August day.
The nearest other city in this atlas is Ziguinchor (107 km away). In August its highs average 29.4°C, 1.1°C warmer than Bissau, with 391 mm of rain.
From August to September, average highs rise by 0.7°C to 29.1°C, and monthly rainfall falls from 452 mm to 307 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bissau climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 32.9°C20.5°C | 20.5°C | 0.3 | 0.1 | 11.512 h |
| February | 34.4°C21.2°C | 21.2°C | 0.8 | 0.1 | 11.712 h |
| March | 35.2°C22.4°C | 22.4°C | 0 | 0.0 | 12.112 h |
| April | 34.8°C23.2°C | 23.2°C | 0 | 0.0 | 12.412 h |
| May | 33.8°C24.2°C | 24.2°C | 6.1 | 1.3 | 12.713 h |
| June | 31.7°C25.3°C | 25.3°C | 87 | 12.0 | 12.813 h |
| July | 28.9°C24.6°C | 24.6°C | 352 | 27.8 | 12.713 h |
| August, selected | 28.3°C24.3°C | 24.3°C | 452 | 29.3 | 12.513 h |
| September | 29.1°C24.4°C | 24.4°C | 307 | 27.7 | 12.212 h |
| October | 30.3°C25.0°C | 25.0°C | 142 | 21.9 | 11.912 h |
| November | 31.9°C24.3°C | 24.3°C | 23 | 4.6 | 11.612 h |
| December | 32.8°C21.6°C | 21.6°C | 1.9 | 0.3 | 11.411 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Ziguinchor in AugustSenegal · 107 kmHigh 29.4°C · Low 23.9°C · 391 mm rain
- Kolda in AugustSenegal · 135 kmHigh 29.7°C · Low 23.5°C · 292 mm rain
- Kamsar in AugustGuinea · 172 kmHigh 27.3°C · Low 24.0°C · 593 mm rain
- Brikama in AugustGambia · 194 kmHigh 28.7°C · Low 24.9°C · 279 mm rain
- Banjul in AugustGambia · 206 kmHigh 28.7°C · Low 25.2°C · 254 mm rain
- Serekunda in AugustGambia · 211 kmHigh 28.4°C · Low 25.3°C · 246 mm rain
- Kaolack in AugustSenegal · 260 kmHigh 30.9°C · Low 24.1°C · 200 mm rain
- Tambacounda in AugustSenegal · 298 kmHigh 30.8°C · Low 23.9°C · 197 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Bissau) is explained once on the Bissau year overview and on the Sources, method and limits page.