July in Alta is the warmest month of the year. In July, the weather in Alta is typically warm. Average daily high temperature in July is about 13 degrees above zero. On average, Alta has 18 rainy, 6 cloudy, 4 sunny, and 3 partly cloudy days in July. The rains are usually moderate. July as well as May, June, August, and September is considered the most uncomfortable time to visit Alta.