May in Perito Moreno is the cloudiest month of the year. In May, the weather in Perito Moreno is typically cold. Average daily high temperature in May is about 7 degrees above zero. On average, Perito Moreno has 17 partly cloudy, 10 sunny, 3 cloudy, and 1 rainy day in May. The rains are usually light. May as well as June, July, August, and September is considered the most uncomfortable time to visit Perito Moreno.