September in Belfort averages a daily high of 21.7°C with nights around 10.3°C. Expect roughly 10.7 wet days totalling 61.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Belfort is May–September.
Based on BASEL MULHOUSE, FR (49.3km), 1995–2024. 30 years of September data.