In September, Wyoming typically sees daytime highs of 23.2°C and overnight lows around 9.8°C. Compared to the annual average high of 14.5°C, September runs +8.7°C.
September in Wyoming averages a daytime high of 23.2°C and an overnight low of 9.8°C.
September runs +8.7°C compared to Wyoming's annual average high of 14.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 23.2°C and cooler evenings around 9.8°C.