Weather will likely play an important role when you plan your trip to Bali, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January with an average temp of 73°F, while the coldest months are July and August with an average of 66°F. The rainiest months in Bali are August, September, July, and June, with each month seeing an average of 14 inches of rainfall.