Taking into account the local weather in Bau-Bau can help you maximize your time at the pool during your trip. The hottest months are usually November and October with an average temp of 81°F, while the coldest months are August and September with an average of 79°F. The rainiest months in Bau-Bau are February, March, December, and January, with each month seeing an average of 14 inches of rainfall.