September in Waskaganish is the rainiest month of the year. In September, the weather in Waskaganish is typically warm. Average daily high temperature in September is about 15 degrees above zero. On average, Waskaganish has 16 rainy, 9 partly cloudy, 4 sunny, and 1 cloudy day in September. The rains are usually heavy. September as well as January, February, October, and December is considered the most uncomfortable time to visit Waskaganish.