September in Sydney averages a daily high of 19.4°C with nights around 9.8°C. Expect roughly 12.3 wet days totalling 131.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sydney is July–September.
Based on SYDNEY A, NS CA (10.8km), 1995–2024. 19 years of September data.