September in Kuujjuaq is the rainiest month of the year. In September, the weather in Kuujjuaq is typically cold. Average daily high temperature in September is about 8 degrees above zero. On average, Kuujjuaq has 21 rainy, 7 cloudy, and 2 sunny days in September. The rains are usually moderate. September as well as January, February, March, and May is considered the most uncomfortable time to visit Kuujjuaq.