September in Kuujjuarapik is the rainiest month of the year. In September, the weather in Kuujjuarapik is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Kuujjuarapik has 17 rainy, 7 partly cloudy, 3 sunny, and 3 cloudy days in September. The rains are usually heavy. September as well as January, February, March, and June is considered the most uncomfortable time to visit Kuujjuarapik.