September in Barranquilla is the hottest month of the year. In September, the weather in Barranquilla is typically hot. Average daily high temperature in September is about 31 degrees above zero. On average, Barranquilla has 22 rainy, 4 sunny, 2 cloudy, and 2 partly cloudy days in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Barranquilla.