In April, the weather in Chepstow is typically warm. Average daily high temperature in April is about 13 degrees above zero. On average, Chepstow has 12 rainy, 8 partly cloudy, 5 sunny, and 5 cloudy days in April. The rains are usually moderate. April as well as January, February, March, and May is considered the most uncomfortable time to visit Chepstow.