April in Reston averages a daily high of 18.6°C with nights around 6°C. Expect roughly 10.4 wet days totalling 80.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Reston is August–October.
Based on VIENNA, VA US (9.6km), 1995–2024. 25 years of April data.