Cotonou weather in September
September in Cotonou: hot, soaked, with clean air — a good time to visit.
#10 of 12 months in Cotonou · #486 of 604 destinations to visit in September · comfort 63/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Cotonou climate normals — September
| Daytime high | 27°C / 81°F | 🥵 hot |
|---|---|---|
| Nighttime low | 24°C / 76°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 192 mm / 7.6 in | ⛈ soaked |
| Rainy days | 24 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 23°C / 74°F | |
| Sunshine | 8.1 h/day | |
| Daylight | 12.2 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cotonou in September — FAQ
- Is September a good time to visit Cotonou?
- September in Cotonou: hot, soaked, with clean air — a good time to visit. It ranks #10 of 12 months for Cotonou on SeasonMap's comfort score (63/100).
- What is the weather like in Cotonou in September?
- In September, Cotonou averages a daily high of 27.2°C and a low of 24.4°C, with about 191.9 mm of rain over roughly 24.2 rainy days.
- What is the air quality in Cotonou in September?
- Cotonou has a mean US Air Quality Index of about 32 in September.