In December, the weather in Coffs Harbour is typically warm. Average daily high temperature in December is about 24 degrees above zero. On average, Coffs Harbour has 12 rainy, 10 sunny, 8 partly cloudy, and 1 cloudy day in December. The rains are usually heavy. December as well as January, February, June, and November is considered the most uncomfortable time to visit Coffs Harbour.