In September, Decatur typically sees daytime highs of 26.5°C and overnight lows around 12.7°C. Compared to the annual average high of 17.2°C, September runs +9.3°C.
September in Decatur averages a daytime high of 26.5°C and an overnight low of 12.7°C.
September runs +9.3°C compared to Decatur's annual average high of 17.2°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 26.5°C and cooler evenings around 12.7°C.