In September, Sydney typically sees daytime highs of 20.2°C and overnight lows around 9.6°C. Compared to the annual average high of 21.9°C, September runs -1.8°C.
September in Sydney averages a daytime high of 20.2°C and an overnight low of 9.6°C.
September runs -1.8°C compared to Sydney's annual average high of 21.9°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 20.2°C and cooler evenings around 9.6°C.