June in Barnaul is the sunniest month of the year. In June, the weather in Barnaul is typically warm. Average daily high temperature in June is about 23 degrees above zero. On average, Barnaul has 13 partly cloudy, 11 sunny, 5 rainy, and 1 cloudy day in June. The rains are usually light. June as well as August is considered the most comfortable time to visit Barnaul.