June in Sundsvall averages a daily high of 18.3°C with nights around 8.2°C. Expect roughly 10.5 wet days totalling 55mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sundsvall is June–August.
Based on SIDSJO, SW (1.5km), 1995–2024. 12 years of June data.