May in Highlands Ranch averages a daily high of 20.6°C with nights around 5.8°C. Expect roughly 10.1 wet days totalling 57.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Highlands Ranch is May–June.
Based on DENVER CENTENNIAL AIRPORT, CO US (10.4km), 1995–2024. 26 years of May data.