Weather is probably a major factor when you plan your trip to Bitung, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and May, with an average temperature of 27°C, while the coldest months are February and January, with an average of 26°C. The rainiest months in Bitung are May, June, November and April, with each month seeing an average of 337 mm of rainfall.