September in Quimper averages a daily high of 19.7°C with nights around 11.6°C. Expect roughly 13.9 wet days totalling 75mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Quimper is June–September.
Based on BREST GUIPAVAS, FR (55km), 1995–2024. 30 years of September data.