June in Kouvola averages a daily high of 21°C with nights around 10.3°C. Expect roughly 12.4 wet days totalling 65mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Kouvola is May–August.
Based on KOUVOLA UTTI LENTOPORTINTIE, FI (13.5km), 1995–2024. 30 years of June data.