July in Viedma is the coldest month of the year. In July, the weather in Viedma is typically warm. Average daily high temperature in July is about 12 degrees above zero. On average, Viedma has 14 sunny, 14 partly cloudy, and 3 rainy days in July. The rains are usually light. July as well as June is considered the most uncomfortable time to visit Viedma.