September in Haninge averages a daily high of 16.7°C with nights around 8.8°C. Expect roughly 9.8 wet days totalling 56.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Haninge is June–August.
Based on HARSFJARDEN, SW (11km), 1995–2024. 24 years of September data.