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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Coast Monitor Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Expect mild, mostly sunny days with cool mornings in Perth this September. Spring is warming up, but a jacket is still useful early and late. Check the live forecast above for today’s exact conditions before heading out.
What is the weather typically like in Perth during September?
September marks the start of spring in Perth. Days are pleasant, with average maximums climbing toward 20°C, while overnight lows sit around 9–10°C. Rainfall drops compared to winter, averaging about 70–80 mm for the month. The city gets around eight hours of sunshine daily, and afternoon sea breezes often pick up along the coast.
How does September compare with other months?
It is a transitional month – wetter than October but drier than August. The chance of a storm is low, and strong cold fronts become less frequent. If you are looking ahead, Perth weather in October brings warmer days and even less rain. For contrast, other Australian cities have very different spring conditions: darwin weather september is hot and humid, while broome weather september stays dry and sunny. The september perth season is a comfortable shoulder period before summer heat arrives.
Does it rain a lot in Perth in September?
Not as much as winter. September averages around 10 rain days, but showers are usually light and brief. Most days stay dry enough for outdoor plans.
What should I wear in Perth in September?
Layers work best. A light jacket or sweater for mornings and evenings, with a T‑shirt underneath for the warmer afternoons. Comfortable walking shoes are fine for the city and beaches.
Is September a good time to visit Perth?
Yes. The weather is mild, crowds are smaller than summer, and wildflowers are blooming in the hills. It is also a good lead‑in to perth weather september october when conditions improve further.