May in Shrewsbury is the rainiest and the cloudiest month of the year. In May, the weather in Shrewsbury is typically warm. Average daily high temperature in May is about 18 degrees above zero. On average, Shrewsbury has 16 rainy, 6 sunny, 5 cloudy, and 4 partly cloudy days in May. The rains are usually heavy. May as well as March and December is considered the most uncomfortable time to visit Shrewsbury.