December weather forecast in Rio das Ostras

December in Rio das Ostras is the rainiest month of the year. In December, the weather in Rio das Ostras is typically hot. Average daily high temperature in December is about 28 degrees above zero. On average, Rio das Ostras has 21 rainy, 4 sunny, 4 partly cloudy, and 2 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and November is considered the most uncomfortable time to visit Rio das Ostras.