January in Turku averages a daily high of -0.9°C with nights around -6.2°C. Expect roughly 15.4 wet days totalling 54.3mm. 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. 21 years of January data.