July in Sugar Land is the rainiest month of the year. In July, the weather in Sugar Land is typically hot. Average daily high temperature in July is about 33 degrees above zero. On average, Sugar Land has 13 rainy, 10 sunny, 5 partly cloudy, and 3 cloudy days in July. The rains are usually heavy. July as well as June, August, and September is considered the most uncomfortable time to visit Sugar Land.