February in Cabo Frio is the hottest month of the year. In February, the weather in Cabo Frio is typically hot. Average daily high temperature in February is about 28 degrees above zero. On average, Cabo Frio has 14 rainy, 7 sunny, 6 partly cloudy, and 2 cloudy days in February. The rains are usually heavy. February as well as January, March, November, and December is considered the most uncomfortable time to visit Cabo Frio.