December in Mandurah is the windiest month of the year. In December, the weather in Mandurah is typically warm. Average daily high temperature in December is about 25 degrees above zero. On average, Mandurah has 27 sunny, 3 partly cloudy, and 1 rainy day in December. The rains are usually light. December as well as March, April, October, and November is considered the most comfortable time to visit Mandurah.