April in Marshfield is the rainiest month of the year. In April, the weather in Marshfield is typically cold. Average daily high temperature in April is about 9 degrees above zero. On average, Marshfield has 17 rainy, 5 sunny, 4 cloudy, and 4 partly cloudy days in April. The rains are usually heavy. April as well as January, March, and November is considered the most uncomfortable time to visit Marshfield.