June in Calgary is the rainiest month of the year. In June, the weather in Calgary is typically warm. Average daily high temperature in June is about 18 degrees above zero. On average, Calgary has 15 rainy, 9 sunny, 5 partly cloudy, and 1 cloudy day in June. The rains are usually heavy. June as well as March, April, May, and November is considered the most uncomfortable time to visit Calgary.