Papua New Guinea weather is warm and sultry year round, with wet and dry seasons typical of the region. The best time to travel is from June through October. During this summer dry season expect some rainfall along with plenty of sunshine. In the coastal areas daytime temperatures range from 75 degrees F to 85 F. In the highlands, daytime temperatures will be in the 75 degrees F range. Nighttime temperatures in the highlands can go as low as 45 degrees F. Expect torrential rains December through April.