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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Wire Hub 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 Perth marks the last full month of spring, delivering mild days, a noticeable warmth returning, and the tail end of the wet season. Expect daytime highs around 19–23°C, cool nights, and a mix of sun and occasional rain.
What is the weather like in Perth during September?
As the live forecast above shows, September sits in the transition from winter to warmer weather. You can expect average maximums of 21°C, with overnight lows dropping to about 9°C. Rainfall is still significant—around 80–90 millimetres across roughly 10–12 wet days—but the city sees more sunshine than in August. It remains a solid shoulder-season pick, especially for travellers wanting to avoid peak summer heat while still enjoying outdoor activities.
Is September a good time to visit Perth?
Yes, particularly for travellers who prefer milder conditions and fewer crowds. The wildflowers across Kings Park and the Swan Valley are in full bloom, making it a prime time for nature walks. Pack layers: a light jacket for the mornings and evenings, plus a raincoat. School holidays fall later in the month, so book accommodation early if you are travelling then. For those comparing Perth Weather across seasons, perth weather september october offers a steady warming trend, with October bringing drier and warmer days.
What season is September in Perth?
September is the first full month of spring in Australia. It is a transitional period, with warming days and decreasing rainfall compared to winter.
What should I pack for Perth in September?
Pack layers: jeans, long-sleeve tops, a fleece or light jacket, and a waterproof jacket. A scarf for cooler evenings and comfortable walking shoes for exploring the city or wildflower trails are also recommended.
How does Perth in September compare to other Australian cities?
Perth is generally milder than Brisbane Weather in September, but warmer and drier than southern capitals. For contrast, darwin weather september is hot and humid, while broome weather september offers dry, sunny days with higher temperatures.