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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Australia Voice Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
August in Perth is the city’s wettest month, with cool, grey days and frequent rain. Average highs sit around 18°C, with lows near 9°C. The live forecast above shows the current conditions, but expect about 13 rainy days and 140 millimetres of rainfall for the month.
What is Perth’s weather like in August?
August is the peak of Perth’s wet season. You can expect cloudy skies, steady drizzle and occasional strong winds from the north-west. Daylight hours are short, with sunset around 5:45pm. It’s a quiet month for outdoor plans, though the rain keeps the parks and gardens lush.
If you are planning travel, note that weather in Perth in September shifts towards spring, with less rain and warmer days. For comparison, Melbourne August weather is cooler and drier, while Sydney Weather in August is milder and less rainy.
How does August compare to other months?
August is Perth’s wettest month, but not the coldest. July has slightly lower average highs. The rain eases quickly into September. If you are heading north, Australia weather varies widely: Darwin weather August is dry and sunny, while Broome weather August is warm with almost no rain. South-west, Margaret River weather August is cool and wet, similar to Perth.
Should I bring a jacket to Perth in August?
Yes. A waterproof jacket and layers are essential. Daytime highs are only 18°C, and rain is common. Evenings drop to 9°C, so a warm coat is useful.
Is August a good time to visit Perth?
It depends on your plans. The rain limits beach days and outdoor events, but it’s a quiet period with lower accommodation prices. September is better for sunnier weather.
Does it rain every day in Perth during August?
No. On average, it rains on 13 days out of 31. You will get some dry spells, but carry an umbrella as showers can be sudden and heavy.