Saint-Louis Weather in September
What's the weather like in Saint-Louis (Saint-Louis) in September 2025?
The climate in Saint-Louis during September can be summarized as very hot, humid and a little damp.
September is in the fall / autumn in Saint-Louis and is typically the warmest month of the year. Daytime maximum temperatures average around a steamy 33°C (91°F), whilst at night 25°C (77°F) is normal.
| Daytime temperature | 32.6°C 90.6°F |
|---|---|
| Nightly temperature | 24.9°C 76.7°F |
| Average temperature | 28.7°C 83.7°F |
| Daily sunshine | 8 hrs |
| Avg rainfall | 95 mm 3.7 ins |
| Rainy days | 6 days |
| Sea temperature | 28.4°C 83.1°F |
| Humidity | 76% |
| Windspeed | 7.6kph 5 mph |
On average September is the wettest month of the year in Saint-Louis with around 95mm 3.7 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.
On the flip side this corresponds to an average of 8 hours of sunshine per day.
September temperatures in Saint-Louis
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Saint-Louis in September 2025.
Other monthly averages
Best places to visit in September
Saint-Louis weather stats
| Hottest month: | September | 32.4°C 90.3°F |
|---|---|---|
| Driest month: | April | 0mm 0ins |
| Sunniest month: | April | 10hrs |
| Coldest month: | January | 29.9°C 85.8°F |
| Wettest month: | September | 95mm 3.7ins |
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