April in Windsor is the sunniest month of the year. In April, the weather in Windsor is typically warm. Average daily high temperature in April is about 13 degrees above zero. On average, Windsor has 11 rainy, 8 partly cloudy, 7 sunny, and 4 cloudy days in April. The rains are usually moderate. April as well as January, February, March, and October is considered the most uncomfortable time to visit Windsor.