July in Cabo Frio is the coldest month of the year. In July, the weather in Cabo Frio is typically warm. Average daily high temperature in July is about 24 degrees above zero. On average, Cabo Frio has 16 sunny, 8 rainy, 5 partly cloudy, and 2 cloudy days in July. The rains are usually light. July as well as June and August is considered the most comfortable time to visit Cabo Frio.