In September, the weather in San Martin De Los Andes is typically cold. Average daily high temperature in September is about 5 degrees above zero. On average, San Martin De Los Andes has 15 rainy, 7 sunny, 5 cloudy, and 3 partly cloudy days in September. The rains are usually moderate. September as well as May, June, July, and August is considered the most uncomfortable time to visit San Martin De Los Andes.