May in Cheyenne averages a daily high of 17.8°C with nights around 4.3°C. Expect roughly 13 wet days totalling 60.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Cheyenne is June.
Based on CHEYENNE WSFO AIRPORT, WY US (1.8km), 1995–2024. 30 years of May data.