September in Saint George's is the hottest month of the year. In September, the weather in Saint George's is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Saint George's has 15 rainy, 13 sunny, and 2 partly cloudy days in September. The rains are usually heavy. September as well as January, June, July, and August is considered the most uncomfortable time to visit Saint George's.