July in Trondheim averages a daily high of 19.5°C with nights around 11.3°C. Expect roughly 17.1 wet days totalling 72.3mm. 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 July data.