July in Trelew is the coldest month of the year. In July, the weather in Trelew is typically warm. Average daily high temperature in July is about 11 degrees above zero. On average, Trelew has 17 sunny, 8 partly cloudy, 4 rainy, and 2 cloudy days in July. The rains are usually light. July as well as June and August is considered the most uncomfortable time to visit Trelew.