September in Blois averages a daily high of 22.5°C with nights around 11.7°C. Expect roughly 9.1 wet days totalling 49.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Blois is May–September.
Based on TOURS, FR (48.2km), 1995–2024. 30 years of September data.