October in Trondheim averages a daily high of 8.9°C with nights around 3.1°C. Expect roughly 18.5 wet days totalling 81.5mm. 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. 27 years of October data.