September in Maniitsoq is the rainiest month of the year. In September, the weather in Maniitsoq is typically cold. Average daily high temperature in September is about 5 degrees above zero. On average, Maniitsoq has 11 rainy, 9 sunny, 9 partly cloudy, and 1 cloudy day in September. The rains are usually heavy. September as well as February and May is considered the most uncomfortable time to visit Maniitsoq.