September in Armidale is the windiest and the sunniest month of the year. In September, the weather in Armidale is typically warm. Average daily high temperature in September is about 16 degrees above zero. On average, Armidale has 24 sunny, 3 rainy, and 3 partly cloudy days in September. The rains are usually light. September as well as February, April, and October is considered the most comfortable time to visit Armidale.