In January, the weather in Port Moresby is typically hot. Average daily high temperature in January is about 30 degrees above zero. On average, Port Moresby has 25 rainy, 3 partly cloudy, 2 cloudy, and 1 sunny day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Port Moresby.