Taking into account the local weather in Las Piedras is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually September and October with an average temp of 80°F, while the coldest months are July and June with an average of 76°F. The rainiest months in Las Piedras are February, January, December, and March, with each month seeing an average of 17 inches of rainfall.