May in Estes Park is the rainiest month of the year. In May, the weather in Estes Park is typically cold. Average daily high temperature in May is about 9 degrees above zero. On average, Estes Park has 26 rainy, 4 sunny, and 1 partly cloudy day in May. The rains are usually heavy. May as well as March, April, and July is considered the most uncomfortable time to visit Estes Park.