September in Cheyenne averages a daily high of 23.4°C with nights around 7.8°C. Expect roughly 6.8 wet days totalling 34.6mm. Comfortable conditions for being outdoors all day.
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 September data.