August in Mehamn is the sunniest and the warmest month of the year. In August, the weather in Mehamn is typically warm. Average daily high temperature in August is about 10 degrees above zero. On average, Mehamn has 14 rainy, 9 cloudy, 4 sunny, and 4 partly cloudy days in August. The rains are usually moderate. August as well as April, May, June, and July is considered the most uncomfortable time to visit Mehamn.