August in Perito Moreno is the rainiest month of the year. In August, the weather in Perito Moreno is typically cold. Average daily high temperature in August is about 4 degrees above zero. On average, Perito Moreno has 15 partly cloudy, 10 sunny, 4 cloudy, and 2 rainy days in August. The rains are usually light. August as well as May, June, July, and September is considered the most uncomfortable time to visit Perito Moreno.