September in Nantes averages a daily high of 22.8°C with nights around 12°C. Expect roughly 10.3 wet days totalling 55.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Nantes is May–September.
Based on NANTES BOUGUENAIS, FR (8.6km), 1995–2024. 30 years of September data.