July in Clackamas is the sunniest month of the year. In July, the weather in Clackamas is typically hot. Average daily high temperature in July is about 28 degrees above zero. On average, Clackamas has 19 sunny, 9 partly cloudy, and 3 rainy days in July. The rains are usually light. July as well as August and September is considered the most comfortable time to visit Clackamas.