Weather in Perth in August 2025
Average weather
Average temperature in Perth in August
Going from a maximum of +29°C during the day to a minimum of +5°C during the night, the temperature in August averages around +20°C.
The average maximum temperature goes up 21% by the end of the month, compared with the beginning of the month, from +24°C to +29°C.
Is Perth warm or cold in August?
Perth is typically mild in August.
Maximum temperatures go up compared to the previous month from +17°C to +18°C. The minimum temperature also goes up from +9°C to +9°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
August is one of the coolest months in Perth, here is the comparison with other months:
Water temperature in Perth in August
Water in Perth in August is Fresh. It varies from +18°C to +20°C, with an average of +19°C. Note that the air temperature is lower than the water temperature, averaging around +18°C.
The water temperature in August is one of the coldest of the entire year:
Can you swim in Perth in August?
Climate in Perth in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +17°C | +18°C | +19°C | ||||
| Min. temperature | ||||||
| -1°C | +1°C | +2°C | ||||
| Max. temperature | ||||||
| +25°C | +29°C | +34°C | ||||
| Rainfall | ||||||
| 121 mm | 103 mm | 63 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +20°C | +19°C | +19°C | ||||
| Humidity | ||||||
| 75% | 74% | 71% | ||||
| Air pressure | ||||||
| 1018 HPa | 1018 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 7 | 9 | 9 | ||||
| Cloudy days | ||||||
| 6 | 6 | 7 | ||||
| Rainy days | ||||||
| 17 | 16 | 14 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August often has better weather than July. It’s getting warmer as August arrives. The average maximum temperature goes up from +17°C to +18°C during the day. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 121 mm to 103 mm. It feels drier, as humidity decreases from 75% to 74%. The average wind speed doesn’t change much during August, staying around 4 m/s. The good news is there are likely to be more sunny days in August, from 7 to 9.
September brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Perth is gradually decreasing during August, going from 5 m/s to 3 m/s over the course of the month.
Rain
How was the weather last August in Perth?
Climate Change over Years
The climate in Perth in August has not changed much over the last 43 years.
The average temperature was the lowest in 1990 (+22°C) and the highest in 2023 (+25°C). The driest year was 2010 with only 285 mm of rainfall, and the wettest year was 2012 with 1017 mm.
FAQ
Is August a good time to visit Perth?
Can you sunbathe in Perth in August?
Can you swim in Perth in August?
Is Perth rainy in August?
Is it sunny in Perth in August?
Other cities in Australia
Monthly weather in Perth
Source of the data
For this page, we’ve looked at the typical weather in Perth, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.