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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 ·
Plan for mild, sunny days and cool nights — September is Perth’s transition from winter to spring, with the live forecast above showing the current trend.
What is the typical weather in Perth during September?
September marks the final month of the wet season, with rainfall decreasing steadily and temperatures climbing into the low 20s. Afternoon sea breezes are common, so pack a light jacket for evenings.
- Average maximum: 20–22°C, minimum: 8–10°C
- Rainfall: about 80–100 mm across 10–12 rainy days
- Sunshine: 8–9 hours daily, with mostly clear mornings
- Humidity: moderate, often around 55–65%
How does September compare with nearby months?
September is warmer and drier than August, but still cooler and wetter than October. It’s a reliable month for outdoor activities before the summer heat arrives.
- Perth weather in August averages 18°C max and 110 mm rain
- Perth weather in October jumps to 23°C max and 60 mm rain
- September sits in the sweet spot: comfortable for exploring the city and surrounds
Is September a good time to visit Perth?
Yes — mild days, less rain than winter, and wildflowers in bloom make it ideal for sightseeing and outdoor activities. Just bring layers for the cool mornings and evenings.
What should I pack for Perth in September?
Light clothing for daytime (t-shirts, jeans), a warm jumper or jacket for evenings, and a rain jacket or umbrella. Sunscreen is still recommended despite the mild temperatures.
How does September weather affect what to do in Perth?
The clear mornings and sunny afternoons are perfect for Kings Park, Cottesloe Beach walks, and the Swan Valley. Whale watching tours also run well into September. Check the live forecast above for exact conditions.
Sources
For broader Australian conditions, see our weather hub, or check Perth weather updates. If planning ahead, note that Perth weather 2026 long-range trends are still speculative; stick to short-term forecasts near your travel date. For comparison, Darwin weather September is much warmer and more humid, while Sydney weather in September is slightly cooler than Perth’s.