In September, Dubuque typically sees daytime highs of 23.0°C and overnight lows around 10.7°C. Compared to the annual average high of 13.9°C, September runs +9.2°C.
September in Dubuque averages a daytime high of 23.0°C and an overnight low of 10.7°C.
September runs +9.2°C compared to Dubuque's annual average high of 13.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 23.0°C and cooler evenings around 10.7°C.