May in Denver averages a daily high of 22.8°C with nights around 7.1°C. Expect roughly 10.3 wet days totalling 68.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Denver is September–October.
Based on DENVER WATER DEPARTMENT, CO US (2.3km), 1995–2024. 27 years of May data.