In September, Des Moines typically sees daytime highs of 24.8°C and overnight lows around 11.7°C. Compared to the annual average high of 15.7°C, September runs +9.1°C.
September in Des Moines averages a daytime high of 24.8°C and an overnight low of 11.7°C.
September runs +9.1°C compared to Des Moines's annual average high of 15.7°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 24.8°C and cooler evenings around 11.7°C.