September in Portoviejo is the windiest month of the year. In September, the weather in Portoviejo is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Portoviejo has 16 cloudy, 7 partly cloudy, 5 rainy, and 2 sunny days in September. The rains are usually light. September as well as August is considered the most comfortable time to visit Portoviejo.