Perth weather by month
Perth runs from about 14°C in July to 26°C in February, with August the wettest month at 168 mm.
warmest month
February
26°C
coolest month
July
14°C
wettest month
August
168 mm
worst air month
June
8 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 25°C | 1 mm | 406 h | 4 |
| February | 26°C | 18 mm | 349 h | 4 |
| March | 23°C | 4 mm | 361 h | 4 |
| April | 21°C | 20 mm | 310 h | 7 |
| May | 19°C | 95 mm | 269 h | 8 |
| June | 15°C | 113 mm | 242 h | 8 |
| July | 14°C | 154 mm | 272 h | 7 |
| August | 15°C | 168 mm | 294 h | 6 |
| September | 16°C | 27 mm | 337 h | 6 |
| October | 18°C | 43 mm | 347 h | 6 |
| November | 20°C | 25 mm | 374 h | 4 |
| December | 24°C | 6 mm | 407 h | 5 |
About 3,968 hours of sun a year. Roughly 68 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.