April in New Ulm is the windiest month of the year. In April, the weather in New Ulm is typically warm. Average daily high temperature in April is about 14 degrees above zero. On average, New Ulm has 11 sunny, 10 rainy, 6 partly cloudy, and 3 cloudy days in April. The rains are usually heavy. April as well as February, March, May, and November is considered the most uncomfortable time to visit New Ulm.