If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Bojonegoro: 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.