In December, the weather in Copacabana is typically warm. Average daily high temperature in December is about 12 degrees above zero. On average, Copacabana has 26 rainy, 2 cloudy, 2 partly cloudy, and 1 sunny day in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Copacabana.