Cotonou weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: December – February
What is the weather like in Cotonou in September?
In September, Cotonou is warm: daytime highs average 27 °C, and even at night it stays warm at around 24 °C. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 22 days, totalling 155 mm. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Cotonou.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 59 | 57 | 56 |
| Day | 26° | 27° | 28° |
| Night | 24° | 24° | 25° |
| Sun | 5 h | 5 h | 7 h |
| Rain days | 17 | 22 | 26 |
More details for September
- Daylight
- 12 h 10 min06:41 – 18:51
- UV index
- 14 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 80 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+1Africa/Porto-Novo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %37 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Cotonou in September: quick answers
Is Cotonou hot in September?
Warm rather than hot: in September, daytime highs in Cotonou average 27 °C and nights cool to about 24 °C.
Does it rain much in Cotonou in September?
It rains often – on about 22 days, adding up to 155 mm.
Cotonou month by month
The whole year in CotonouAll destinations: BeninWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences