May in Wrexham is the sunniest month of the year. In May, the weather in Wrexham is typically warm. Average daily high temperature in May is about 14 degrees above zero. On average, Wrexham has 17 rainy, 6 sunny, 5 partly cloudy, and 3 cloudy days in May. The rains are usually moderate. May as well as January, February, April, and June is considered the most uncomfortable time to visit Wrexham.