If you planning to travel to Casa del Libro, San Juan, Puerto Rico, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 10:27 AM. The temperature feels like 77.45 with a humidity level of 79 so dress accordingly. Cloud coverage is 25 percent with visibility at 14.7 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling east-southeast at a speed of 5 MPH. At the end of the day don’t miss the sunset at 9:43 PM.