April in Sundsvall averages a daily high of 7.4°C with nights around -2°C. Expect roughly 8.2 wet days totalling 39.1mm. 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. 12 years of April data.