March in Trondheim is the rainiest month of the year. In March, the weather in Trondheim is typically cold. Average daily high temperature in March is about 2 degrees above zero. On average, Trondheim has 24 rainy, 5 sunny, and 2 cloudy days in March. The rains are usually heavy. March as well as February, April, May, and June is considered the most uncomfortable time to visit Trondheim.