Weather will likely play an important role when you plan your trip to Buka Island, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually January and February, with an average temperature of 26°C, while the coldest months are September and August, with an average of 25°C. The rainiest months in Buka Island are August, April, July and March, with each month seeing an average of 571 mm of rainfall.