December in Belo Horizonte is the rainiest and the cloudiest month of the year. In December, the weather in Belo Horizonte is typically warm. Average daily high temperature in December is about 23 degrees above zero. On average, Belo Horizonte has 30 rainy and 1 sunny day in December. The rains are usually heavy. December as well as January, February, March, and October is considered the most uncomfortable time to visit Belo Horizonte.