July in Rio de Janeiro is the coldest month of the year. In July, the weather in Rio de Janeiro is typically warm. Average daily high temperature in July is about 25 degrees above zero. On average, Rio de Janeiro has 15 sunny, 7 rainy, 6 partly cloudy, and 3 cloudy days in July. The rains are usually moderate. July as well as June and August is considered the most comfortable time to visit Rio de Janeiro.