June in West Yellowstone is the rainiest and the windiest month of the year. In June, the weather in West Yellowstone is typically warm. Average daily high temperature in June is about 17 degrees above zero. On average, West Yellowstone has 13 sunny, 12 rainy, 4 partly cloudy, and 1 cloudy day in June. The rains are usually heavy. June as well as March, April, May, and October is considered the most uncomfortable time to visit West Yellowstone.