Perth climate
Perth (Western Australia, Australia) has a hot-summer Mediterranean climate (Köppen Csa). The average temperature over the year is 19 °C66 °F, and about 659 mm26 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Perth climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2679 | 1966 | 2373 | 180.7 |
| Feb | 2780 | 2068 | 2374 | 170.7 |
| Mar | 2678 | 1966 | 2272 | 200.8 |
| Apr | 2373 | 1763 | 2068 | 341.3 |
| May | 2169 | 1660 | 1865 | 843.3 |
| Jun | 1966 | 1458 | 1762 | 1134.5 |
| Jul | 1864 | 1456 | 1660 | 1285.1 |
| Aug | 1864 | 1356 | 1560 | 1064.2 |
| Sep | 1864 | 1356 | 1660 | 702.7 |
| Oct | 2068 | 1458 | 1763 | 321.3 |
| Nov | 2272 | 1661 | 1967 | 251.0 |
| Dec | 2476 | 1864 | 2170 | 120.5 |
| Year | 2780 | 1356 | 1966 | 65926 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 65% | 33% | 8.2 | 14:01 |
| Feb | 65% | 37% | 7.3 | 13:16 |
| Mar | 65% | 40% | 6.1 | 12:22 |
| Apr | 69% | 51% | 4.5 | 11:21 |
| May | 69% | 54% | 3.3 | 10:30 |
| Jun | 71% | 59% | 2.7 | 10:04 |
| Jul | 73% | 60% | 2.9 | 10:15 |
| Aug | 74% | 58% | 3.8 | 10:58 |
| Sep | 73% | 53% | 5.0 | 11:57 |
| Oct | 73% | 45% | 6.5 | 12:56 |
| Nov | 69% | 40% | 7.8 | 13:49 |
| Dec | 65% | 36% | 8.4 | 14:14 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Perth is like
The warmest month is February, with an average high of 27 °C80 °F and a low of 20 °C68 °F. The coldest is August, when highs average 18 °C64 °F and lows 13 °C56 °F. Seasonal differences are small — just 7.8 °C14 °F between the warmest and the coolest month.
Annual precipitation is moderate at about 659 mm26 in. The wettest three-month stretch is June–August, which brings 53% of the annual total. Months with less than 20 mm0.8 in on average: December–March. The wettest month is July (128 mm5.1 in), the driest is December (12 mm0.5 in).
Relative humidity ranges from 65% in January to 74% in August. The clearest skies (lowest average cloud amount, 33%) are typical of January. Average wind speed near the ground ranges from 17 km/h (11 mph) in April to 20 km/h (13 mph) in January. Daylight lasts from about 10.1 hours in June to 14.2 hours in December.
Best time to visit Perth
Based on these averages, the most comfortable months for sightseeing and outdoor activities are October–May: average highs of 20 °C68 °F to 27 °C80 °F with 12 mm0.5 in to 84 mm3.3 in of precipitation per month.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
Perth weather by month
- 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
What to pack for Perth
- Summer (December–February) — highs 2476 to 27 °C80 °F, lows 1864 to 20 °C68 °F, about 16 mm0.6 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
- Autumn (March–May) — highs 2169 to 26 °C78 °F, lows 1660 to 19 °C66 °F, about 46 mm1.8 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Winter (June–August) — highs 1864 to 19 °C66 °F, lows 1356 to 14 °C58 °F, about 116 mm4.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Spring (September–November) — highs 1864 to 22 °C72 °F, lows 1356 to 16 °C61 °F, about 42 mm1.7 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
How Perth compares
Of the 39 places in Australia covered by World Climates, Perth is the 16th warmest by annual mean temperature and the 27th wettest by annual precipitation. See all of them on the Australia climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Somerset West (South Africa, Csa), Paarl (South Africa, Csa) and Funchal (Portugal, Csb).
Nearby places
- Mandurah 65 km · 19 °C66 °F · 746 mm29 in
- Augusta 271 km · 17 °C63 °F · 706 mm28 in
- Roebourne 1,250 km · 28 °C82 °F · 327 mm13 in
- Marble Bar 1,259 km · 27 °C81 °F · 428 mm17 in
Frequently asked questions
What is the warmest month in Perth?
February is the warmest month in Perth, with an average high of 27 °C (80 °F) and an average low of 20 °C (68 °F).
What is the coldest month in Perth?
August is the coldest month, with an average high of 18 °C (64 °F) and an average low of 13 °C (56 °F).
When does it rain the most in Perth?
July is the wettest month with about 128 mm (5.1 in) of precipitation; December is the driest with about 12 mm (0.5 in).
What is the best time to visit Perth?
Judging by long-term averages, the most comfortable months are October–May.
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.