June in Washington averages a daily high of 29.3°C with nights around 19.5°C. Expect roughly 10.8 wet days totalling 110.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Washington is April–May.
Based on WASHINGTON REAGAN NATIONAL AIRPORT, VA US (5.3km), 1995–2024. 30 years of June data.