May in Strahan is the cloudiest month of the year. In May, the weather in Strahan is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Strahan has 25 rainy, 4 sunny, and 2 partly cloudy days in May. The rains are usually heavy. May as well as April, June, July, and August is considered the most uncomfortable time to visit Strahan.