Spring in Sydney
Sydney Weather in September
On average, Sydney sees a top of 21°C and an overnight low of 12°C in September, with around 10 rain days and 68mm of total rainfall. UV is typically high, 6-8.
21°C
12°C
68mm
10
What September is like in Sydney
September is Sydney's driest month on average and the gateway to spring. Temperatures warm quickly, with many days reaching the low-to-mid 20s under clear skies. Jacaranda trees begin their purple bloom across the inner suburbs. The return of northeasterly sea breezes signals the end of winter's westerly-dominated pattern. UV levels climb rapidly — sun protection becomes necessary again. The first thunderstorms of the new storm season may appear over the western suburbs late in the month.
These figures are long-term averages, not a forecast — for today's actual conditions and the week ahead, check the live Sydney weather forecast. Averages are useful for planning travel, events or what to pack, but any single September can run warmer, cooler, wetter or drier than the long-term normal.