August in Mikkeli averages a daily high of 20.7°C with nights around 9.8°C. Expect roughly 11.9 wet days totalling 63.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Mikkeli is June–August.
Based on MIKKELI LENTOASEMA, FI (3.3km), 1995–2024. 30 years of August data.