Weather is probably a major factor when you plan your trip to Bojonegoro, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and October with an average temp of 83°F, while the coldest months are July and August with an average of 80°F. The rainiest months in Bojonegoro are February, March, December, and January, with each month seeing an average of 15 inches of rainfall.