October in Sundsvall averages a daily high of 8°C with nights around 1.5°C. Expect roughly 12.5 wet days totalling 81.9mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Sundsvall is June–August.
Based on SIDSJO, SW (1.5km), 1995–2024. 11 years of October data.