Perth weather in December
In December, Perth has an average high of 24 °C76 °F and an average low of 18 °C64 °F, with about 12 mm0.5 in of precipitation. It is the 4th warmest month of the year and the driest.
How December compares with other months
Compared with November, December is 1.9 °C3.4 °F warmer on average and drier by 13 mm0.5 in. Compared with January, December is 1.6 °C2.8 °F cooler on average and drier by 6 mm0.2 in. Daylight lasts about 14.2 hours around the middle of the month. Average relative humidity is 65% and the average cloud amount 36%.
Is December a good time to visit Perth?
Yes — December is one of the most comfortable months to visit Perth by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in December
For Perth in December, pack light summer clothes such as T-shirts, shorts or light dresses.
December in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Perth | 2476 | 1864 | 120.5 |
| Mandurah | 2577 | 1864 | 140.5 |
| Augusta | 1966 | 1662 | 200.8 |
| Roebourne | 40104 | 2577 | 180.7 |
| Marble Bar | 42107 | 2679 | 371.4 |
Nearby places that are more than 1 °C1.8 °F warmer in December: Roebourne and Marble Bar; cooler: Augusta.
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 December?
In December the average high in Perth is 24 °C (76 °F) and the average low is 18 °C (64 °F).
Does it rain a lot in Perth in December?
On average about 12 mm (0.5 in) of precipitation falls in December; it ranks 12th of the 12 months.
Is December 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 December?
In the middle of December the day in Perth lasts about 14.2 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Perth in December?
The average relative humidity in December is about 65%. This is a long-term average for the whole day.
How cloudy is Perth in December?
On average about 36% of the sky is covered by cloud in December. 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.