SeasonMapSaint-Louis weather in September
Senegal
September in Saint-Louis: sweltering, a little rain, with muggy air — a gamble, with 39°C afternoons.
#12 of 12 months in Saint-Louis · #1078 of 1383 destinations to visit in September · comfort 62/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Saint-Louis in September
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Saint-Louis climate normals — September
| Daytime high | 33°C / 91°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 78°F | |
| Feels like (high) | 39°C / 102°F | |
| Sea temperature | 30°C / 86°F | ♨️ bath-warm |
| Rainfall | 64 mm / 2.5 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 25°C / 78°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12.2 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 74 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Saint-Louis in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Quietschool holidays in 2 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Saint-Louis's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherSaint-Louis's weather peaks January–March.
Best weatherFair weatherToughest weather
Where is Saint-Louis?
Saint-Louis in September — FAQ
- Is September a good time to visit Saint-Louis?
- September in Saint-Louis: sweltering, a little rain, with muggy air — a gamble, with 39°C afternoons. It ranks #12 of 12 months for Saint-Louis on SeasonMap's comfort score (62/100).
- What is the weather like in Saint-Louis in September?
- In September, Saint-Louis averages a daily high of 32.8°C and a low of 25.4°C, with about 63.6 mm of rain over roughly 8.2 rainy days.
- What is the air quality in Saint-Louis in September?
- Saint-Louis has a mean US Air Quality Index of about 74 in September.