November in Rio das Ostras is the rainiest and the cloudiest month of the year. In November, the weather in Rio das Ostras is typically warm. Average daily high temperature in November is about 25 degrees above zero. On average, Rio das Ostras has 16 rainy, 6 sunny, 6 partly cloudy, and 2 cloudy days in November. The rains are usually heavy. November as well as March and December is considered the most uncomfortable time to visit Rio das Ostras.