March in Namsos is the rainiest and the cloudiest month of the year. In March, the weather in Namsos is typically cold. Average daily high temperature in March is about 2 degrees above zero. On average, Namsos has 25 rainy, 3 sunny, 1 snowy, 1 cloudy, and 1 partly cloudy day in March. The rains are usually heavy. March as well as April, May, June, and July is considered the most uncomfortable time to visit Namsos.