In September, Dayton typically sees daytime highs of 25.4°C and overnight lows around 12.2°C. Compared to the annual average high of 16.6°C, September runs +8.8°C.
September in Dayton averages a daytime high of 25.4°C and an overnight low of 12.2°C.
September runs +8.8°C compared to Dayton's annual average high of 16.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 25.4°C and cooler evenings around 12.2°C.