September in Coral Harbour is the rainiest and the windiest month of the year. In September, the weather in Coral Harbour is typically cold. Average daily high temperature in September is about 4 degrees above zero. On average, Coral Harbour has 11 cloudy, 8 partly cloudy, 6 rainy, and 5 sunny days in September. The rains are usually moderate. September as well as January, February, March, and April is considered the most uncomfortable time to visit Coral Harbour.