May in Crested Butte is the rainiest month of the year. In May, the weather in Crested Butte is typically cold. Average daily high temperature in May is about 7 degrees above zero. On average, Crested Butte has 24 rainy, 6 sunny, and 1 cloudy day in May. The rains are usually heavy. May as well as April, July, August, and September is considered the most uncomfortable time to visit Crested Butte.