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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Southern Focus Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
September in Sydney marks the start of spring, with average highs near 20°C and warming after the coolest months, though the live forecast above shows day-to-day variation that can include isolated showers.
What is Sydney’s weather like in September?
Days are mild and increasingly sunny, but the transition from winter can still bring cool mornings and occasional rain. September is typically drier than August, with about 70–90 millimetres of rain spread across roughly 10–12 rain days.
- Average maximum temperature: 20–21°C (68–70°F), with occasional days reaching into the mid-20s.
- Overnight lows: 10–12°C (50–54°F) — a light jacket remains useful in early spring.
- Sunshine hours increase to around 7 hours per day, compared with 6 in August.
- Coastal winds can pick up, especially in the afternoon, but strong southerly busters are less frequent.
How does Sydney compare with other Australian cities in September?
Sydney’s spring September is generally warmer and drier than Melbourne, where melbourne weather september brings cooler highs near 17°C and more cloud. It is also milder than Brisbane, but less rainy than the northern NSW coast.
- In Sydney, average September temperatures in Celsius sit around 20°C — for reference, sydney weather september fahrenheit is about 68°F.
- Much of NSW experiences similar spring warming, though inland areas are cooler overnight.
- Across australia weather september celsius, southern capitals warm noticeably: Perth reaches 21°C, Adelaide 19°C, and Hobart just 16°C.
What about weather in Sydney in October?
October brings further warming, with average highs climbing to 22–23°C and rainfall decreasing slightly. If you’re planning ahead, the weather in sydney in october and weather in sydney in september and october both offer pleasant conditions, though October is typically sunnier.
Is September a good time to visit Sydney?
Yes — September offers mild temperatures, fewer crowds, and a range of outdoor events including the Cherry Blossom Festival. You can expect occasional showers, so pack a light layer and an umbrella.
Does it rain a lot in Sydney during September?
Rainfall is moderate — about 80 mm spread over 11 days. It is not the wettest month, but a few drizzly days are typical, often clearing quickly. Check the live forecast above for real-time rain radar.
Is Sydney colder than Melbourne in September?
No — Sydney is noticeably warmer. Melbourne’s September averages 17°C, while Sydney sits around 20°C. Both cities can have cool nights, but Sydney has more sunny days and less wind.