May in Belfort averages a daily high of 20.6°C with nights around 9.4°C. Expect roughly 14.2 wet days totalling 86.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Belfort is May–September.
Based on BASEL MULHOUSE, FR (49.3km), 1995–2024. 30 years of May data.