July in Hermosillo is the rainiest and the cloudiest month of the year. In July, the weather in Hermosillo is typically hot. Average daily high temperature in July is about 35 degrees above zero. On average, Hermosillo has 13 rainy, 8 sunny, 8 partly cloudy, and 2 cloudy days in July. The rains are usually heavy. July as well as August is considered the most uncomfortable time to visit Hermosillo.