July in Rancagua is the coldest month of the year. In July, the weather in Rancagua is typically warm. Average daily high temperature in July is about 14 degrees above zero. On average, Rancagua has 11 sunny, 8 rainy, 7 partly cloudy, and 5 cloudy days in July. The rains are usually heavy. July as well as June, August, and September is considered the most uncomfortable time to visit Rancagua.