Climate Insights for Saint-Louis

The climate in Saint-Louis is hot. The average annual temperature is 26°C and approximately 157mm of precipitation falls per year. September is the wettest month, receiving around 84mm of rainfall. Saint-Louis is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: October, January, November. The coldest months are March, May, April, when temperatures can drop to 19°C.

Saint-Louis sees moderate temperature variation throughout the year, ranging from 19°C to 33°C. The warmest month is October, when average highs reach 33°C and the mean temperature sits around 29°C. March is the coolest month, with minimum temperatures around 19°C and an average of 23°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows.

Saint-Louis is a quite dry location, receiving approximately 157mm of precipitation annually, which averages out to around 13mm per month. The wettest month is September, averaging 84mm of rainfall. August and July also tend to see above-average precipitation. The driest month is January, with just 0mm. That's 84mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Saint-Louis is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.

It is currently summer in Saint-Louis, which began on June 21, 2026. Saint-Louis is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in October at around 33°C, while the coldest stretch bottoms out in March near 19°C. Autumn is next, beginning on September 23, 2026 — 63 days from now.

The best time to visit Saint-Louis is during March, April, May and June, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 0mm per month. By contrast, October can be uncomfortably hot with temperatures reaching 33°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Saint-Louis based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.