Climate Insights for Saint-Louis

The climate in Saint-Louis is warm and mild. The average annual temperature is 20°C and approximately 1676mm of precipitation falls per year. Saint-Louis receives a notable amount of rainfall throughout the year, including during its driest month. Saint-Louis is in the Southern Hemisphere. The seasons are reversed: summer runs from December to February, while winter falls between June and August. The summer months are: February, January, March. The coldest months are August, July, September, when temperatures can drop to 15°C.

Saint-Louis sees moderate temperature variation throughout the year, ranging from 15°C to 26°C. The warmest month is February, when average highs reach 26°C and the mean temperature sits around 23°C. August is the coolest month, with minimum temperatures around 15°C and an average of 17°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between April and May, with a 2°C shift in average temperatures.

Saint-Louis is a fairly wet location, receiving approximately 1676mm of precipitation annually, which averages out to around 140mm per month. The wettest month is January, averaging 308mm of rainfall. February and March also tend to see above-average precipitation. The driest month is September, with just 46mm. That's 262mm less than January, 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 8km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 10km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.

It is currently winter in Saint-Louis, which began on June 21, 2026. Saint-Louis is in the Southern Hemisphere, where the seasons are reversed: spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 26°C, while the coldest stretch bottoms out in August near 15°C. Spring is next, beginning on September 23, 2026 (1 days from now).

The best time to visit Saint-Louis is during May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 67mm per month. By contrast, February can be uncomfortably hot with temperatures reaching 26°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

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.