December in Barretos is the rainiest and the cloudiest month of the year. In December, the weather in Barretos is typically warm. Average daily high temperature in December is about 27 degrees above zero. On average, Barretos has 29 rainy and 2 sunny days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Barretos.