Taking the local weather in Puerto Rico 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 January and December, with an average temperature of 25°C, while the coldest months are July and June, with an average of 17°C. The rainiest months in Puerto Rico are October, January, May and December, with each month seeing an average of 224 mm of rainfall.