May in Puerto Viejo is the cloudiest month of the year. In May, the weather in Puerto Viejo is typically warm. Average daily high temperature in May is about 27 degrees above zero. On average, Puerto Viejo has 27 rainy, 2 cloudy, and 2 partly cloudy days in May. The rains are usually heavy. May as well as April, June, July, and August is considered the most uncomfortable time to visit Puerto Viejo.