June in Whistler is the rainiest month of the year. In June, the weather in Whistler is typically warm. Average daily high temperature in June is about 15 degrees above zero. On average, Whistler has 17 rainy, 8 partly cloudy, 4 sunny, and 1 cloudy day in June. The rains are usually heavy. June as well as February, March, April, and May is considered the most uncomfortable time to visit Whistler.