January in Mikkeli averages a daily high of -4.5°C with nights around -10.7°C. Expect roughly 17.8 wet days totalling 45mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Mikkeli is June–August.
Based on MIKKELI LENTOASEMA, FI (3.3km), 1995–2024. 29 years of January data.