May in Concord is the rainiest and the cloudiest month of the year. In May, the weather in Concord is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Concord has 15 rainy, 6 sunny, 6 partly cloudy, and 4 cloudy days in May. The rains are usually moderate. May as well as March, November, and December is considered the most uncomfortable time to visit Concord.