Taking into account the local weather in Alotau is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually January and February with an average temp of 81°F, while the coldest months are August and July with an average of 77°F. The rainiest months in Alotau are January, February, March, and December, with each month seeing an average of 15 inches of rainfall.