Western Australia (Perth)
September
Weather in Western Australia for September 2025
Your guide to Western Australia weather in September - trends and predictions
Until now, September 2025 in Western Australia is slightly cooler than the historical average by -1.6 °C.
The forecast for the upcoming days in Western Australia predicts a temperature of 21.6 °C, which is slightly above the historical average.
In general, the average temperature in Western Australia at the beginning of September is 18.1 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 23.3 °C by the end of September.
The climate of Western Australia in September is notably wet, with an average of 13 rainy days, and a total of 51.8 mm of precipitation.
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Temperatures
Rain 🌧️
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17
Dry days
13
Rainy days
0
Snow days
20°/11°
Temperatures
21 km/h
Avg max wind
64 %
Avg humidity
Western Australia Weather September
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What’s the Weather Like in Western Australia This September?
Discover the average temperatures and weather trends across Western Australia’s cities this September.
Temperatures trend during September in Western Australia
See the weather trend as well as the moving average line
September weather in Western Australia day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Moderate rain at times | 19° /11° | 2 mm | 6 | |
| 2 Sept. |  Patchy rain possible | 18° /10° | 1.9 mm | 5 | |
| 3 Sept. |  Overcast | 17° /10° | 5.2 mm | 5 | |
| 4 Sept. | Light rain shower | 18° /11° | 3.6 mm | 5 | |
| 5 Sept. | Light rain shower | 17° /10° | 11.4 mm | 5 | |
| 6 Sept. | Light rain shower | 18° /10° | 5.2 mm | 5 | |
| 7 Sept. |  Sunny | 20° /10° | 1.7 mm | 6 | |
| 8 Sept. | Overcast | 20° /10° | 0.3 mm | 6 | |
| 9 Sept. | Moderate or heavy rain shower | 19° /10° | 3.2 mm | 6 | |
| 10 Sept. |  Partly cloudy | 19° /9° | 0.2 mm | 6 | |
| 11 Sept. | Sunny | 21° /10° | 0.1 mm | 7 | |
| 12 Sept. | Sunny | 22° /11° | 1.1 mm | 6 | |
| 13 Sept. | Sunny | 19° /11° | 8.7 mm | 6 | |
| 14 Sept. | Partly cloudy | 19° /11° | 2 mm | 6 | |
| 15 Sept. |  Heavy rain at times | 18° /11° | 2.2 mm | 5 | |
| 16 Sept. | Patchy rain possible | 16° /11° | 1 mm | 1.2 | |
| 17 Sept. |  Moderate rain | 18° /13° | 7.1 mm | 1.1 | |
| 18 Sept. | Patchy rain possible | 17° /14° | 0.4 mm | 1 | |
| 19 Sept. | Patchy rain possible | 18° /13° | 0.3 mm | 1 | |
| 20 Sept. | Sunny | 21° /12° | 0 mm | 2 | |
| 21 Sept. | Sunny | 23° /13° | 0 mm | 6 | |
| 22 Sept. | Sunny | 24° /15° | 0 mm | 6 | |
| 23 Sept. | Sunny | 26° /17° | 0 mm | 7 | |
| 24 Sept. | Sunny | 27° /17° | 0 mm | 7 | |
| 25 Sept. | Sunny | 27° /18° | 0 mm | 7 | |
| 26 Sept. | Sunny | 26° /18° | 0 mm | 7 | |
| 27 Sept. | Sunny | 24° /17° | 0 mm | 7 | |
| 28 Sept. | Moderate rain | 17° /14° | 7 mm | 5 | |
| 29 Sept. | Patchy rain possible | 19° /15° | 2 mm | 5 | |
| 30 Sept. | Patchy rain possible | 23° /13° | 0.5 mm | 7 | |
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Important Notice
Our weather forecast for Western Australia in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Western Australia forecast closer to your planned date for the most up-to-date weather information.
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Western Australia in September - FAQ
What are the expected maximum and minimum temperatures in Western Australia during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Western Australia during September?
Moderate rainfall is anticipated in Western Australia during September, with a total of 51.8 mm spread over approximately 13 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Western Australia during September?
The average wind speed in Western Australia during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Western Australia
Explore the daily rainfall trends and prepare for Western Australias September weather 💧
UV exposure in Western Australia during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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