July in Grayling is the sunniest and the warmest month of the year. In July, the weather in Grayling is typically warm. Average daily high temperature in July is about 24 degrees above zero. On average, Grayling has 17 sunny, 8 rainy, and 6 partly cloudy days in July. The rains are usually moderate. July as well as September is considered the most comfortable time to visit Grayling.