In September, Perth typically sees daytime highs of 19.4°C and overnight lows around 9.4°C. Compared to the annual average high of 23.6°C, September runs -4.2°C.
September in Perth averages a daytime high of 19.4°C and an overnight low of 9.4°C.
September runs -4.2°C compared to Perth's annual average high of 23.6°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 19.4°C and cooler evenings around 9.4°C.