October in Kotka averages a daily high of 9.1°C with nights around 5.4°C. Expect roughly 13.8 wet days totalling 66.9mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Kotka is June–August.
Based on KOTKA RANKKI, FI (10.2km), 1995–2024. 29 years of October data.