October in Downtown DC averages a daily high of 21.2°C with nights around 9.3°C. Expect roughly 9.1 wet days totalling 98.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Downtown DC is April–May.
Based on NATIONAL ARBORETUM DC, MD US (4.8km), 1995–2024. 27 years of October data.