Perth weather in August
In August, Perth has an average high of 18 °C64 °F and an average low of 13 °C56 °F, with about 106 mm4.2 in of precipitation. August is the coldest month of the year and ranks 3rd for precipitation.
How August compares with other months
Compared with July, August is about the same temperature and drier by 22 mm0.9 in. Compared with September, August is about the same temperature and wetter by 37 mm1.4 in. Daylight lasts about 11.0 hours around the middle of the month. Average relative humidity is 74% and the average cloud amount 58%.
Is August a good time to visit Perth?
August is not among the most comfortable months by our comfort score: it is cool (average high 18 °C64 °F) and it is fairly wet (106 mm4.2 in). The most comfortable months in Perth are October–May.
What to wear in August
For Perth in August, pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
August in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Perth | 1864 | 1356 | 1064.2 |
| Mandurah | 1763 | 1356 | 1204.7 |
| Augusta | 1661 | 1457 | 973.8 |
| Roebourne | 3086 | 1558 | 10.0 |
| Marble Bar | 3086 | 1355 | 10.0 |
Nearby places that are more than 1 °C1.8 °F warmer in August: Roebourne and Marble Bar.
Other months in Perth
- January26 °C79 °F / 19 °C66 °F
- February27 °C80 °F / 20 °C68 °F
- March26 °C78 °F / 19 °C66 °F
- April23 °C73 °F / 17 °C63 °F
- May21 °C69 °F / 16 °C60 °F
- June19 °C66 °F / 14 °C58 °F
- July18 °C64 °F / 14 °C56 °F
- August18 °C64 °F / 13 °C56 °F
- September18 °C64 °F / 13 °C56 °F
- October20 °C68 °F / 14 °C58 °F
- November22 °C72 °F / 16 °C61 °F
- December24 °C76 °F / 18 °C64 °F
Frequently asked questions
How warm is Perth in August?
In August the average high in Perth is 18 °C (64 °F) and the average low is 13 °C (56 °F).
Does it rain a lot in Perth in August?
On average about 106 mm (4.2 in) of precipitation falls in August; it ranks 3rd of the 12 months.
Is August the warmest month in Perth?
No. The warmest month in Perth is February, with an average high of 27 °C (80 °F). The coldest month is September, with an average low of 13 °C (56 °F).
How long is the day in Perth in August?
In the middle of August the day in Perth lasts about 11.0 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Perth in August?
The average relative humidity in August is about 74%. This is a long-term average for the whole day.
How cloudy is Perth in August?
On average about 58% of the sky is covered by cloud in August. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.