September in Lyon averages a daily high of 22.9°C with nights around 13°C. Expect roughly 8.5 wet days totalling 74.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Lyon is May–September.
Based on LYON ST EXUPERY, FR (18km), 1995–2024. 30 years of September data.