January in Coffs Harbour is the warmest month of the year. In January, the weather in Coffs Harbour is typically warm. Average daily high temperature in January is about 25 degrees above zero. On average, Coffs Harbour has 13 rainy, 12 sunny, 5 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as February, June, November, and December is considered the most uncomfortable time to visit Coffs Harbour.