In September, the weather in San Martin De Los Andes is typically cold. Average daily high temperature in September is about 6 degrees above zero. On average, San Martin De Los Andes has 8 rainy, 8 cloudy, 8 partly cloudy, and 6 sunny days in September. The rains are usually heavy. September as well as April, May, June, and July is considered the most uncomfortable time to visit San Martin De Los Andes.