Cotonou weather in September
September is one of the least pleasant months in Cotonou: highs of 27°C (81°F) and about 198 mm (7.8 in) of rain on average. Nights average 23°C (74°F) and cloud cover 76% (NASA POWER, 2001–2025 averages). It is the 2nd wettest month of the year and the 3rd coolest. Compared with August, it is about as warm and wetter; October brings highs of 28°C (82°F) and 172 mm (6.8 in) of rain.
Is September a good time to visit Cotonou?
least pleasant month Weather score 52/100.
September is one of the least pleasant months for weather in Cotonou. For better conditions, consider Nov–Feb.
Does it rain a lot in Cotonou in September?
Yes, it is one of the rainy months: about 198 mm (7.8 in) falls in an average September. It is the 2nd wettest month of the year.
How warm is Cotonou in September?
Days average 27°C (81°F) and nights 23°C (74°F).
Cotonou weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 30°C (86°F) | 23°C (74°F) | 20 mm | 37% | best |
| February | 30°C (86°F) | 25°C (77°F) | 32 mm | 51% | best |
| March | 30°C (86°F) | 26°C (78°F) | 78 mm | 68% | fair |
| April | 29°C (85°F) | 26°C (78°F) | 119 mm | 73% | fair |
| May | 29°C (84°F) | 25°C (78°F) | 174 mm | 74% | least pleasant |
| June | 28°C (82°F) | 24°C (76°F) | 216 mm | 77% | least pleasant |
| July | 27°C (80°F) | 23°C (74°F) | 165 mm | 78% | least pleasant |
| August | 27°C (80°F) | 23°C (73°F) | 93 mm | 73% | fair |
| September | 27°C (81°F) | 23°C (74°F) | 198 mm | 76% | least pleasant |
| October | 28°C (82°F) | 24°C (75°F) | 172 mm | 68% | least pleasant |
| November | 29°C (84°F) | 25°C (76°F) | 55 mm | 50% | best |
| December | 30°C (85°F) | 24°C (75°F) | 20 mm | 35% | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months