In August, the weather in Mo i Rana is typically warm. Average daily high temperature in August is about 12 degrees above zero. On average, Mo i Rana has 16 rainy, 5 sunny, 5 cloudy, and 5 partly cloudy days in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Mo i Rana.