May in Saint-Louis averages a daily high of 27.5°C with nights around 20°C. Expect roughly 11.9 wet days totalling 96mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Saint-Louis is May–November.
Based on ST DENIS GILLOT, RE (45.5km), 1995–2024. 14 years of May data.