September in Bern averages a daily high of 20.2°C with nights around 9.7°C. Expect roughly 9.9 wet days totalling 71.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Bern is June–September.
Based on PAYERNE, SZ (40.5km), 1995–2024. 29 years of September data.