Weather will likely play an important role when you plan your trip to Busia, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and March with an average temp of 73°F, while the coldest months are June and November with an average of 70°F. The rainiest months in Busia are April, May, March, and November, with each month seeing an average of 12 inches of rainfall.