September in Churchill is the rainiest month of the year. In September, the weather in Churchill is typically cold. Average daily high temperature in September is about 9 degrees above zero. On average, Churchill has 13 rainy, 8 cloudy, 7 partly cloudy, and 2 sunny days in September. The rains are usually heavy. September as well as January, February, March, and December is considered the most uncomfortable time to visit Churchill.