September in Guiria is the hottest month of the year. In September, the weather in Guiria is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Guiria has 19 rainy, 10 sunny, and 1 partly cloudy day in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Guiria.