April in Lisle is the rainiest and the windiest month of the year. In April, the weather in Lisle is typically warm. Average daily high temperature in April is about 13 degrees above zero. On average, Lisle has 15 rainy, 7 partly cloudy, 6 sunny, and 2 cloudy days in April. The rains are usually heavy. April as well as March, November, and December is considered the most uncomfortable time to visit Lisle.