In September, the weather in Happy Valley-Goose Bay is typically warm. Average daily high temperature in September is about 14 degrees above zero. On average, Happy Valley-Goose Bay has 14 rainy, 8 partly cloudy, 5 sunny, and 3 cloudy days in September. The rains are usually heavy. September as well as January, February, April, and May is considered the most uncomfortable time to visit Happy Valley-Goose Bay.