Climate averages 1991–2020
Mandurah weather
in December.
A hot, very dry month: the 4th warmest and one of the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Mandurah: daytime highs average 28.0°C and nights cool to about 16.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 12 mm of rain on roughly 2 days, which makes December a very dry month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 14 h 14 min on an average December day.
The nearest other city in this atlas is Perth (65 km away). In December its highs average 29.0°C, 1.0°C warmer than Mandurah, with 9.3 mm of rain.
Among the 32 cities listed in Australia, Mandurah ranks joint 8th of 32 for the warmest December highs and 3rd of 32 for the driest December (rainfall, lowest first). The mean December high of those 32 cities is 26.0°C; Mandurah is 2.0°C warmer than that mean.
From December to January, average highs rise by 2.2°C to 30.2°C, and monthly rainfall stays at 12 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Mandurah climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.2°C18.2°C | 18.2°C | 12 | 1.4 | 14.014 h |
| February | 30.3°C18.5°C | 18.5°C | 16 | 1.4 | 13.313 h |
| March | 28.1°C17.3°C | 17.3°C | 18 | 2.5 | 12.312 h |
| April | 24.3°C15.1°C | 15.1°C | 25 | 4.3 | 11.311 h |
| May | 20.5°C12.6°C | 12.6°C | 73 | 8.1 | 10.510 h |
| June | 17.5°C10.9°C | 10.9°C | 111 | 11.2 | 10.010 h |
| July | 16.4°C9.9°C | 9.9°C | 111 | 13.0 | 10.210 h |
| August | 16.8°C9.8°C | 9.8°C | 96 | 11.5 | 10.911 h |
| September | 17.8°C10.4°C | 10.4°C | 64 | 9.1 | 11.912 h |
| October | 20.9°C12.0°C | 12.0°C | 29 | 5.0 | 12.913 h |
| November | 24.6°C14.5°C | 14.5°C | 23 | 4.1 | 13.814 h |
| December, selected | 28.0°C16.5°C | 16.5°C | 12 | 1.9 | 14.214 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Mandurah) is explained once on the Mandurah year overview and on the Sources, method and limits page.