Weather will likely play an important role when you plan your trip to Madang, and keep in mind that cheaper options are usually available when the weather isn’t as good. The hottest months are usually October and November with an average temp of 80°F, while the coldest months are July and August with an average of 80°F. The rainiest months in Madang are March, December, April, and February, with each month seeing an average of 23 inches of rainfall.