July in Mount-Hagen is the coldest month of the year. In July, the weather in Mount-Hagen is typically warm. Average daily high temperature in July is about 17 degrees above zero. On average, Mount-Hagen has 27 rainy, 2 partly cloudy, 1 sunny, and 1 cloudy day in July. The rains are usually heavy. July as well as January, February, March, and April is considered the most uncomfortable time to visit Mount-Hagen.