September in Coonamble is the sunniest month of the year. In September, the weather in Coonamble is typically warm. Average daily high temperature in September is about 22 degrees above zero. On average, Coonamble has 26 sunny, 2 rainy, and 2 partly cloudy days in September. The rains are usually heavy. September as well as April is considered the most comfortable time to visit Coonamble.