Weather will likely play an important role when you plan your trip to Jayapura, 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 78°F, while the coldest months are August and July with an average of 77°F. The rainiest months in Jayapura are December, March, April, and November, with each month seeing an average of 15 inches of rainfall.