June in Kotka averages a daily high of 17.9°C with nights around 11.5°C. Expect roughly 9.9 wet days totalling 44.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kotka is June–August.
Based on KOTKA RANKKI, FI (10.2km), 1995–2024. 30 years of June data.