In terms of precipitation, rainfall in Goroka ranges from 1.7 - 10.7 inches per month. March is typically the wettest month, when rainfall can reach 10.7 in. June is typically the driest time to visit Goroka when rainfall is around 1.7 in.
If weather is an important factor for your trip to Goroka, use this chart to help with planning. For those seeking warmer temperatures, December is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 68.0 F).