April in Warrenton is the rainiest month of the year. In April, the weather in Warrenton is typically warm. Average daily high temperature in April is about 18 degrees above zero. On average, Warrenton has 14 rainy, 9 sunny, and 7 partly cloudy days in April. The rains are usually heavy. April as well as January, February, March, and December is considered the most uncomfortable time to visit Warrenton.