Perth is typically warm in December.

Maximum temperatures go up compared to the previous month from +77°F to +82°F. The minimum temperature also goes up from +59°F to +63°F.

It’s generally warm, but pack a long-sleeve shirt for evenings.

Take a look at how December is compared to other months in Perth:

Water in Perth in December is Fresh. It varies from +65°F to +73°F, with an average of +69°F. The air temperature averaging +82°F is higher than the water temperature.

In December, water temperatures are average relative to the rest of the year:

December weather is still as great as in November. It’s getting warmer as December arrives. The average maximum temperature goes up from +77°F to +82°F during the day. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 21 mm to 10 mm. It feels drier, as humidity decreases from 60% to 55%. The average wind speed doesn’t change much during December, staying around 5 m/s. The good news is there are likely to be more sunny days in December, from 14 to 20.

January brings much the same weather, it remains great.

The climate in Perth in December has not changed that much over the last 43 years.

The average temperature was the lowest in 1990 (+72°F) and the highest in 2024 (+79°F). The driest year was 2010 with only 285 mm of rainfall, and the wettest year was 2012 with 1017 mm.

For this page, we’ve looked at the typical weather in Perth, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.