Climate averages 1991–2020
Bissau weather
in September.
A hot, very wet month: the 10th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Bissau: daytime highs average 29.1°C and nights cool to about 24.4°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 307 mm of rain on roughly 28 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 12 min on an average September day.
The nearest other city in this atlas is Ziguinchor (107 km away). In September its highs average 30.1°C, 1.0°C warmer than Bissau, with 307 mm of rain.
From September to October, average highs rise by 1.3°C to 30.3°C, and monthly rainfall falls from 307 mm to 142 mm.
The annual picture
September 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 | 28.3°C24.3°C | 24.3°C | 452 | 29.3 | 12.513 h |
| September, selected | 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
September in nearby cities
- Ziguinchor in SeptemberSenegal · 107 kmHigh 30.1°C · Low 23.8°C · 307 mm rain
- Kolda in SeptemberSenegal · 135 kmHigh 30.1°C · Low 23.4°C · 211 mm rain
- Kamsar in SeptemberGuinea · 172 kmHigh 28.1°C · Low 24.0°C · 405 mm rain
- Brikama in SeptemberGambia · 194 kmHigh 29.3°C · Low 25.0°C · 196 mm rain
- Banjul in SeptemberGambia · 206 kmHigh 29.2°C · Low 25.4°C · 190 mm rain
- Serekunda in SeptemberGambia · 211 kmHigh 28.8°C · Low 25.5°C · 174 mm rain
- Kaolack in SeptemberSenegal · 260 kmHigh 31.1°C · Low 24.1°C · 147 mm rain
- Tambacounda in SeptemberSenegal · 298 kmHigh 31.0°C · Low 23.7°C · 159 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.