In April, the weather in Evanston is typically cold. Average daily high temperature in April is about 9 degrees above zero. On average, Evanston has 11 sunny, 10 partly cloudy, 5 rainy, 2 snowy, and 2 cloudy days in April. The rains are usually moderate. April as well as February, March, May, and November is considered the most uncomfortable time to visit Evanston.