July in Casa Grande is the cloudiest month of the year. In July, the weather in Casa Grande is typically hot. Average daily high temperature in July is about 38 degrees above zero. On average, Casa Grande has 15 sunny, 14 partly cloudy, 1 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 Casa Grande.