July in Crested Butte is the warmest month of the year. In July, the weather in Crested Butte is typically warm. Average daily high temperature in July is about 17 degrees above zero. On average, Crested Butte has 24 rainy, 6 sunny, and 1 partly cloudy day in July. The rains are usually heavy. July as well as April, May, August, and September is considered the most uncomfortable time to visit Crested Butte.