August in Port Moresby is the sunniest month of the year. In August, the weather in Port Moresby is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Port Moresby has 17 partly cloudy, 11 sunny, 2 rainy, and 1 cloudy day in August. The rains are usually light. August as well as July is considered the most comfortable time to visit Port Moresby.