July in Aspen is the rainiest and the warmest month of the year. In July, the weather in Aspen is typically warm. Average daily high temperature in July is about 16 degrees above zero. On average, Aspen 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 Aspen.