September in Jyväskylä averages a daily high of 14.2°C with nights around 5.3°C. Expect roughly 12.3 wet days totalling 57.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Jyväskylä is June–August.
Based on JYVASKYLA LENTOASEMA, FI (18km), 1995–2024. 30 years of September data.