May in Old Orchard Beach is the rainiest and the cloudiest month of the year. In May, the weather in Old Orchard Beach is typically warm. Average daily high temperature in May is about 14 degrees above zero. On average, Old Orchard Beach has 13 rainy, 7 sunny, 6 cloudy, and 5 partly cloudy days in May. The rains are usually moderate. May as well as February, March, April, and December is considered the most uncomfortable time to visit Old Orchard Beach.