In September, the weather in Puerto Viejo de Sarapiquí is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Puerto Viejo de Sarapiquí has 24 rainy, 2 sunny, 2 cloudy, and 2 partly 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 Puerto Viejo de Sarapiquí.