May in Port Graham is the sunniest month of the year. In May, the weather in Port Graham is typically cold. Average daily high temperature in May is about 7 degrees above zero. On average, Port Graham has 16 rainy, 7 sunny, 5 partly cloudy, and 3 cloudy days in May. The rains are usually moderate. May as well as April, June, July, and August is considered the most uncomfortable time to visit Port Graham.