August in Kotka averages a daily high of 20.3°C with nights around 14.7°C. Expect roughly 10.1 wet days totalling 51.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Kotka is June–August.
Based on KOTKA RANKKI, FI (10.2km), 1995–2024. 30 years of August data.