May in El Chalten is the rainiest and the cloudiest month of the year. In May, the weather in El Chalten is typically cold. Average daily high temperature in May is about 3 degrees above zero. On average, El Chalten has 17 rainy, 7 sunny, 5 partly cloudy, and 2 cloudy days in May. The rains are usually heavy. May as well as April, June, July, and August is considered the most uncomfortable time to visit El Chalten.