Visiting local bars in Goroka is better when you know what the weather holds. These rainfall averages and temperatures can help you decide the best time for bar hopping. 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.