August in Coffs Harbour is the sunniest month of the year. In August, the weather in Coffs Harbour is typically warm. Average daily high temperature in August is about 18 degrees above zero. On average, Coffs Harbour has 21 sunny, 6 rainy, 3 partly cloudy, and 1 cloudy day in August. The rains are usually moderate. August as well as September is considered the most comfortable time to visit Coffs Harbour.