January in Puerto Viejo is the sunniest and the coldest month of the year. In January, the weather in Puerto Viejo is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Puerto Viejo has 16 partly cloudy, 13 sunny, 1 rainy, and 1 cloudy day in January. The rains are usually light. January as well as February, March, and December is considered the most comfortable time to visit Puerto Viejo.