Taking the local weather in Mount Hagen into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually November and May, with an average temperature of 17°C, while the coldest months are August and July, with an average of 16°C. The rainiest months in Mount Hagen are March, January, February and December, with each month seeing an average of 726 mm of rainfall.