Weather can make or break a road trip, so here's some data about year-round temperatures in Lae to help you plan yours: The hottest months are usually September and August, with an average temperature of 28°C, while the coldest months are February and March, with an average of 27°C. The rainiest months in Lae are October, November, September and August, with each month seeing an average of 307 mm of rainfall.