September · Benin
Best time to visit Cotonou in September Weather, crowds & prices
Weather in Cotonou in September
Average temperature 26°C, 207 mm of rain, about 15 days with 6+ hours of sunshine and 89% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
4.1/10
Ranked #9 of 12 months
- Avg temp
- 26°C
- Rainfall
- 207 mm
- Humidity
- 89%
- Days with 6h+ sun
- 15
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Cotonou scores 4.1/10 for sightseeing and cultural travel - ranked #9 of 12. Expect around 26°C, 207 mm of rain, and roughly 15 days with 6+ hours of sunshine this month.
Cotonou is Benin's largest city, set between the Atlantic and Lake Nokoue, with a huge market and stilt-village trips.
September in Cotonou — off-season conditions
At 26°C (78°F) this is comfortable city weather in September, with sightseeing easiest before lunch and after the afternoon peak.
Expect monsoon-level rainfall at 207 mm: only about 15 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 4.1/10 on the same scale — 9th of 12 months, versus 7.6/10 for the best month here.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella.
Budget for low-season pricing, and crowds are light for this destination.
If your dates are flexible, December is materially better in Cotonou — 3.5 points higher on the same scale.
Frequently asked
- What is the weather like in Cotonou in September?
- In September, Cotonou averages 26°C, 207 mm of rain, and about 15 days with 6+ hours of sunshine. Its climate-comfort score is 4.1/10.
- Is September a good time to visit Cotonou?
- September earns a 4.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cotonou in September?
- Expect about 207 mm of rain in September. Average humidity is 89% and there are about 15 days with 6+ hours of sunshine.
Curated in Cotonou
Tickets & experiences
Things to do in Cotonou
Cotonou, Benin. Live activities and tours from GetYourGuide, matched to this destination.