June in Washington averages a daily high of 18.3°C with nights around 9.4°C. Expect roughly 11.9 wet days totalling 60.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Washington is June–September.
Based on DURHAM, UK (15.3km), 1995–2024. 30 years of June data.