July in Mianyang is the hottest month of the year. In July, the weather in Mianyang is typically hot. Average daily high temperature in July is about 29 degrees above zero. On average, Mianyang has 18 rainy, 8 sunny, 3 cloudy, and 2 partly cloudy days in July. The rains are usually heavy. July as well as August and September is considered the most uncomfortable time to visit Mianyang.