January in Trondheim averages a daily high of 1.3°C with nights around -4°C. Expect roughly 17 wet days totalling 79mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Trondheim is June–August.
Based on TRONDHEIM VOLL, NO (3.6km), 1995–2024. 26 years of January data.