July in Rio Branco is the sunniest month of the year. In July, the weather in Rio Branco is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, Rio Branco has 20 sunny, 8 partly cloudy, and 3 rainy days in July. The rains are usually light. July as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Rio Branco.