September in Burnie is the windiest month of the year. In September, the weather in Burnie is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Burnie has 9 rainy, 9 partly cloudy, 8 sunny, and 4 cloudy days in September. The rains are usually moderate. September as well as July and August is considered the most uncomfortable time to visit Burnie.