Perth weather in July
In July, Perth has an average high of 18 °C64 °F and an average low of 14 °C56 °F, with about 128 mm5.1 in of precipitation. It is the 11th warmest month of the year and the wettest.
How July compares with other months
Compared with June, July is 1 °C1.9 °F cooler on average and wetter by 15 mm0.6 in. Compared with August, July is about the same temperature and wetter by 22 mm0.9 in. Daylight lasts about 10.2 hours around the middle of the month. Average relative humidity is 73% and the average cloud amount 60%.
Is July a good time to visit Perth?
July is not among the most comfortable months by our comfort score: it is cool (average high 18 °C64 °F) and it is fairly wet (128 mm5.1 in). The most comfortable months in Perth are October–May.
What to wear in July
For Perth in July, pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
July in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Perth | 1864 | 1456 | 1285.1 |
| Mandurah | 1763 | 1356 | 1425.6 |
| Augusta | 1762 | 1558 | 1194.7 |
| Roebourne | 2882 | 1457 | 110.4 |
| Marble Bar | 2781 | 1253 | 170.7 |
Nearby places that are more than 1 °C1.8 °F warmer in July: 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 July?
In July the average high in Perth is 18 °C (64 °F) and the average low is 14 °C (56 °F).
Does it rain a lot in Perth in July?
On average about 128 mm (5.1 in) of precipitation falls in July; it ranks 1st of the 12 months.
Is July 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 July?
In the middle of July the day in Perth lasts about 10.2 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Perth in July?
The average relative humidity in July is about 73%. This is a long-term average for the whole day.
How cloudy is Perth in July?
On average about 60% of the sky is covered by cloud in July. 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.