In March, the weather in Oshkosh is typically cold. Average daily high temperature in March is about 5 degrees above zero. On average, Oshkosh has 9 sunny, 9 partly cloudy, 7 cloudy, 4 rainy, and 2 snowy days in March. The rains are usually heavy. March as well as February, April, October, and November is considered the most uncomfortable time to visit Oshkosh.