January in Reston averages a daily high of 5.8°C with nights around -3.8°C. Expect roughly 11.7 wet days totalling 82mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Reston is August–October.
Based on VIENNA, VA US (9.6km), 1995–2024. 29 years of January data.