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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Down Under Brief Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Perth’s September weather marks the final stretch of spring, with the live forecast above showing a typical mix of mild days, cool nights, and the last of the winter rains before the dry summer sets in.
What is the typical weather in Perth during September?
September in Perth brings average maximums around 21–23°C and minimums of 9–11°C, with the city receiving about 80–100 millimetres of rain across roughly 10–12 wet days. The Swan River and coastal suburbs like Cottesloe and Scarborough see increasing sunshine, though a brisk south-westerly breeze often picks up by afternoon. Compared to Perth weather in August, September is noticeably drier and warmer, while perth weather in october will be hotter and far less rainy.
What should visitors expect in early September?
For perth weather in early september, expect cool mornings around 8–10°C, warming to 19–21°C by midday. Wildflowers in Kings Park and the Swan Valley are at their peak, making it a prime time for outdoor activities. If you’re planning what to do in perth in september, pack layers and a light jacket for evenings, as temperatures drop quickly after sunset.
Is September a good time to visit Perth?
Yes, September offers mild spring weather, blooming wildflowers, and fewer crowds than summer. It’s ideal for outdoor exploring, though you’ll still need a jacket for cooler mornings and evenings.
How does September compare to Perth weather in August?
September is warmer and drier than August, with average highs rising from 19°C to 22°C and rainfall dropping by about 20–30 mm. The chance of a sunny day increases significantly.
Does it rain a lot in Perth during September?
Rain is still common, but less frequent than in winter. Expect around 10–12 wet days, often as short showers or drizzle, with many days remaining partly cloudy and dry.