July in Oslo averages a daily high of 22.7°C with nights around 13.4°C. Expect roughly 14.4 wet days totalling 94.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Oslo is June–September.
Based on OSLO BLINDERN, NO (3.6km), 1995–2024. 30 years of July data.