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 5 degrees above zero. On average, Rio Gallegos has 12 partly cloudy, 10 sunny, 5 cloudy, and 4 rainy days in July. The rains are usually light. July as well as January, April, May, and June is considered the most uncomfortable time to visit Rio Gallegos.