August in San Agustin is the warmest month of the year. In August, the weather in San Agustin is typically warm. Average daily high temperature in August is about 24 degrees above zero. On average, San Agustin has 28 sunny, 2 partly cloudy, and 1 rainy day in August. The rains are usually light. August as well as May, June, July, and September is considered the most comfortable time to visit San Agustin.