In January, the weather in Cabo Frio is typically hot. Average daily high temperature in January is about 28 degrees above zero. On average, Cabo Frio has 16 rainy, 8 sunny, 4 partly cloudy, and 3 cloudy days in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit Cabo Frio.