October in Mikkeli averages a daily high of 7.5°C with nights around 1.4°C. Expect roughly 15.6 wet days totalling 60.7mm. 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. 30 years of October data.