You might spend a lot of your vacation inside, but if you're planning to venture beyond the casino, taking a look at local weather data can help you. The hottest months are usually September and October with an average temp of 71°F, while the coldest months are July and June with an average of 65°F. The rainiest months in Belo Horizonte are December, January, November, and February, with each month seeing an average of 10 inches of rainfall.