Taking into account the local weather in Puerto Viejo can help you maximize your time at the pool during your trip. The hottest months are usually February and January with an average temp of 65°F, while the coldest months are July and August with an average of 57°F. From January through March, the daytime average is 72°F and the nighttime average is 60°F. Between April and June, temperatures average 68°F during the day and 53°F at night. July through September averages 63°F during the day and 51°F at night. In October-December, the average temperature is 68°F during the day and 55°F at night.