December in Turku averages a daily high of 1.7°C with nights around -3.2°C. Expect roughly 16.7 wet days totalling 72.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Turku is June–August.
Based on TURKU ARTUKAINEN, FI (4.8km), 1995–2024. 22 years of December data.