In September, the weather in San Fernando de Monte Cristi is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, San Fernando de Monte Cristi has 13 sunny, 9 partly cloudy, 6 rainy, and 2 cloudy days in September. The rains are usually heavy. September as well as October and November is considered the most uncomfortable time to visit San Fernando de Monte Cristi.