March in Nyköping is the sunniest month of the year. In March, the weather in Nyköping is typically cold. Average daily high temperature in March is about 4 degrees above zero. On average, Nyköping has 10 sunny, 10 cloudy, 7 partly cloudy, 3 rainy, and 1 snowy day in March. The rains are usually light. March as well as January, February, April, and May is considered the most uncomfortable time to visit Nyköping.