July in Centreville averages a daily high of 31.1°C with nights around 19.3°C. Expect roughly 10.8 wet days totalling 103.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Centreville is September–October.
Based on WASHINGTON DULLES INTERNATIONAL AIRPORT, VA US (10.6km), 1995–2024. 30 years of July data.