In September, Allen typically sees daytime highs of 31.5°C and overnight lows around 19.0°C. Compared to the annual average high of 24.4°C, September runs +7.0°C.
September in Allen averages a daytime high of 31.5°C and an overnight low of 19.0°C.
September runs +7.0°C compared to Allen's annual average high of 24.4°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 31.5°C and cooler evenings around 19.0°C.