June in Oslo averages a daily high of 20.8°C with nights around 11.1°C. Expect roughly 12.9 wet days totalling 83.3mm. 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 June data.