July in Rio Gallegos is the coldest month of the year. In July, the weather in Rio Gallegos is typically cold. Average daily high temperature in July is about 4 degrees above zero. On average, Rio Gallegos has 13 partly cloudy, 7 rainy, 6 sunny, and 5 cloudy days in July. The rains are usually light. July as well as April, May, June, and August is considered the most uncomfortable time to visit Rio Gallegos.