September in Sydney averages a daily high of 21.8°C with nights around 12.4°C. Expect roughly 7.6 wet days totalling 64.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Sydney is July–February.
Based on SYDNEY OBSERVATORY HILL, AS (0.8km), 1995–2024. 25 years of September data.