Climate averages 1991–2020
Saint-Louis weather
in September.
A hot, moderately wet month: the 3rd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Saint-Louis: daytime highs average 30.9°C and nights cool to about 26.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 52 mm of rain on roughly 7 days, which makes September a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 14 min on an average September day.
The nearest other city in this atlas is Louga (53 km away). In September its highs average 32.5°C, 1.6°C warmer than Saint-Louis, with 89 mm of rain.
Among the 16 cities listed in Senegal, Saint-Louis ranks 8th of 16 for the warmest September highs and 1st of 16 for the driest September (rainfall, lowest first). The mean September high of those 16 cities is 31.1°C; Saint-Louis is 0.1°C cooler than that mean.
From September to October, average highs rise by 1.1°C to 32.1°C, and monthly rainfall falls from 52 mm to 13 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Saint-Louis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.0°C18.4°C | 18.4°C | 2.7 | 0.2 | 11.311 h |
| February | 27.4°C18.9°C | 18.9°C | 1.4 | 0.2 | 11.612 h |
| March | 27.9°C19.3°C | 19.3°C | 0.1 | 0.0 | 12.012 h |
| April | 27.6°C19.3°C | 19.3°C | 0.1 | 0.0 | 12.512 h |
| May | 28.1°C20.5°C | 20.5°C | 0 | 0.0 | 12.913 h |
| June | 28.9°C22.7°C | 22.7°C | 0.8 | 0.3 | 13.113 h |
| July | 29.5°C24.6°C | 24.6°C | 11 | 2.0 | 13.013 h |
| August | 30.1°C25.6°C | 25.6°C | 57 | 7.7 | 12.713 h |
| September, selected | 30.9°C26.1°C | 26.1°C | 52 | 7.2 | 12.212 h |
| October | 32.1°C25.6°C | 25.6°C | 13 | 2.1 | 11.812 h |
| November | 31.0°C23.2°C | 23.2°C | 0.3 | 0.1 | 11.411 h |
| December | 28.6°C20.2°C | 20.2°C | 1.7 | 0.3 | 11.211 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Louga in SeptemberSenegal · 53 kmHigh 32.5°C · Low 24.5°C · 89 mm rain
- Richard-Toll in SeptemberSenegal · 98 kmHigh 35.8°C · Low 25.5°C · 55 mm rain
- Tivaouane in SeptemberSenegal · 124 kmHigh 30.6°C · Low 24.3°C · 108 mm rain
- Touba in SeptemberSenegal · 144 kmHigh 31.8°C · Low 23.7°C · 120 mm rain
- Thiès in SeptemberSenegal · 144 kmHigh 30.8°C · Low 24.0°C · 120 mm rain
- Thiès Nones in SeptemberSenegal · 146 kmHigh 30.3°C · Low 24.4°C · 120 mm rain
- Mbaké in SeptemberSenegal · 150 kmHigh 31.6°C · Low 23.6°C · 120 mm rain
- Diourbel in SeptemberSenegal · 155 kmHigh 31.5°C · Low 23.9°C · 124 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Saint-Louis) is explained once on the Saint-Louis year overview and on the Sources, method and limits page.