In March, the weather in New Ulm is typically cold. Average daily high temperature in March is about 5 degrees above zero. On average, New Ulm has 10 sunny, 9 partly cloudy, 7 cloudy, 3 rainy, and 2 snowy days in March. The rains are usually heavy. March as well as February, April, May, and November is considered the most uncomfortable time to visit New Ulm.