In September, Tempe Junction typically sees daytime highs of 37.4°C and overnight lows around 21.0°C. Compared to the annual average high of 29.8°C, September runs +7.6°C.
September in Tempe Junction averages a daytime high of 37.4°C and an overnight low of 21.0°C.
September runs +7.6°C compared to Tempe Junction's annual average high of 29.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 37.4°C and cooler evenings around 21.0°C.