Taking the local weather in Puerto Viejo into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually September and May, with an average temperature of 26°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in Puerto Viejo are November, July, August and June, with each month seeing an average of 497 mm of rainfall.