December in Södertälje averages a daily high of 1.9°C with nights around -2.8°C. Expect roughly 16.3 wet days totalling 57.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Södertälje is June–September.
Based on SODERTALJE, SW (0.7km), 1995–2024. 30 years of December data.