July in Port Moresby is the windiest and the coldest month of the year. In July, the weather in Port Moresby is typically hot. Average daily high temperature in July is about 28 degrees above zero. On average, Port Moresby has 17 partly cloudy, 7 sunny, 6 cloudy, and 1 rainy day in July. The rains are usually light. July as well as August is considered the most comfortable time to visit Port Moresby.