May in Södertälje averages a daily high of 16.7°C with nights around 5.4°C. Expect roughly 10.5 wet days totalling 45.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Södertälje is June–September.
Based on SODERTALJE, SW (0.7km), 1995–2024. 30 years of May data.