June in Vaasa averages a daily high of 19.2°C with nights around 9°C. Expect roughly 13 wet days totalling 47.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Vaasa is July–August.
Based on VAASA VAASAN LENTOASEMA, FI (9.8km), 1995–2024. 18 years of June data.