July in Sherman–Denison is the sunniest month of the year. In July, the weather in Sherman–Denison is typically hot. Average daily high temperature in July is about 34 degrees above zero. On average, Sherman–Denison has 19 sunny, 6 rainy, 4 partly cloudy, and 2 cloudy days in July. The rains are usually moderate. July as well as January, February, March, and May is considered the most uncomfortable time to visit Sherman–Denison.