July in Graz is the warmest month of the year. In July, the weather in Graz is typically warm. Average daily high temperature in July is about 23 degrees above zero. On average, Graz has 17 sunny, 8 partly cloudy, 5 rainy, and 1 cloudy day in July. The rains are usually light. July as well as August is considered the most comfortable time to visit Graz.