July in Scottsdale is the cloudiest and the hottest month of the year. In July, the weather in Scottsdale is typically hot. Average daily high temperature in July is about 37 degrees above zero. On average, Scottsdale has 18 sunny, 12 partly cloudy, and 1 rainy day in July. The rains are usually light. July as well as June and August is considered the most uncomfortable time to visit Scottsdale.