September in Liberia is the rainiest and the cloudiest month of the year. In September, the weather in Liberia is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Liberia has 27 rainy and 3 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 Liberia.