In September, the weather in Breckenridge is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Breckenridge has 14 sunny, 10 rainy, 5 partly cloudy, and 1 snowy day in September. The rains are usually moderate. September as well as March, April, May, and July is considered the most uncomfortable time to visit Breckenridge.