In September, the weather in San Juan de los Morros is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, San Juan de los Morros has 26 rainy, 2 cloudy, and 2 partly cloudy 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 Juan de los Morros.