Weather will likely play an important role when you plan your trip to Barbacena, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and February with an average temp of 67°F, while the coldest months are July and August with an average of 61°F. The rainiest months in Barbacena are December, November, January, and February, with each month seeing an average of 10 inches of rainfall.