August in Trondheim averages a daily high of 18.5°C with nights around 10.8°C. Expect roughly 16.4 wet days totalling 86.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Trondheim is June–August.
Based on TRONDHEIM VOLL, NO (3.6km), 1995–2024. 27 years of August data.