May in Manchester is the rainiest and the cloudiest month of the year. In May, the weather in Manchester is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Manchester has 16 rainy, 6 sunny, 5 cloudy, and 4 partly cloudy days in May. The rains are usually moderate. May as well as February, March, November, and December is considered the most uncomfortable time to visit Manchester.