In September, Normal typically sees daytime highs of 25.8°C and overnight lows around 12.2°C. Compared to the annual average high of 16.4°C, September runs +9.4°C.
September in Normal averages a daytime high of 25.8°C and an overnight low of 12.2°C.
September runs +9.4°C compared to Normal's annual average high of 16.4°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 25.8°C and cooler evenings around 12.2°C.