In September, Cheyenne typically sees daytime highs of 22.5°C and overnight lows around 5.3°C. Compared to the annual average high of 14.6°C, September runs +7.9°C.
September in Cheyenne averages a daytime high of 22.5°C and an overnight low of 5.3°C.
September runs +7.9°C compared to Cheyenne's annual average high of 14.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 22.5°C and cooler evenings around 5.3°C.