Taking into account the local weather in Goroka is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually November and December with an average temp of 65°F, while the coldest months are July and August with an average of 64°F. The rainiest months in Goroka are December, March, April, and January, with each month seeing an average of 18 inches of rainfall.