September in Barbados (International Airport) is the cloudiest and the hottest month of the year. In September, the weather in Barbados (International Airport) is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Barbados (International Airport) has 21 rainy, 5 partly cloudy, 2 sunny, and 2 cloudy days in September. The rains are usually heavy. September as well as June, July, August, and October is considered the most uncomfortable time to visit Barbados (International Airport).