July in Cabo Frio is the sunniest and 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 26 sunny, 4 partly cloudy, and 1 rainy day in July. The rains are usually light. July as well as May, June, and August is considered the most comfortable time to visit Cabo Frio.