Average Temperature in Perth by Month

Perth has a Mediterranean climate, classified as Csa in the Köppen system. The warmest month is January with an average high of 31°C, while the coldest month is July with lows dropping to 9°C. The annual temperature range of 22°C reflects moderate seasonal variation.

The driest month is December with only 2 rain days and 10mm of precipitation. For travellers, December through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 70% to 70% throughout the year.