August in Mosjoen is the rainiest and the cloudiest month of the year. In August, the weather in Mosjoen is typically warm. Average daily high temperature in August is about 15 degrees above zero. On average, Mosjoen has 19 rainy, 7 partly cloudy, 3 cloudy, and 2 sunny days in August. The rains are usually heavy. August as well as March, April, May, and June is considered the most uncomfortable time to visit Mosjoen.