June in Mount-Hagen is the sunniest month of the year. In June, the weather in Mount-Hagen is typically warm. Average daily high temperature in June is about 18 degrees above zero. On average, Mount-Hagen has 25 rainy, 2 cloudy, 2 partly cloudy, and 1 sunny day in June. The rains are usually heavy. June as well as January, February, March, and April is considered the most uncomfortable time to visit Mount-Hagen.