May in Haninge averages a daily high of 14.4°C with nights around 4.9°C. Expect roughly 9.6 wet days totalling 42.3mm. 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 May data.