July in Glendale is the hottest month of the year. In July, the weather in Glendale is typically hot. Average daily high temperature in July is about 40 degrees above zero. On average, Glendale has 20 sunny, 6 partly cloudy, 4 rainy, and 1 cloudy day in July. The rains are usually light. July as well as June and August is considered the most uncomfortable time to visit Glendale.