In September, Fort Smith typically sees daytime highs of 30.1°C and overnight lows around 16.7°C. Compared to the annual average high of 22.7°C, September runs +7.4°C.
September in Fort Smith averages a daytime high of 30.1°C and an overnight low of 16.7°C.
September runs +7.4°C compared to Fort Smith's annual average high of 22.7°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 30.1°C and cooler evenings around 16.7°C.