January in Kotka averages a daily high of -1.9°C with nights around -6.2°C. Expect roughly 15.6 wet days totalling 45.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Kotka is June–August.
Based on KOTKA RANKKI, FI (10.2km), 1995–2024. 30 years of January data.