The temperature stays around 80 degrees all year. The peak tourist season is December through April, but anytime is a good time to visit, although tourist crowds between May and November are more manageable. That’s hurricane season, so some tourists would rather visit in January and February when the weather is perfect. You don’t need a passport or a visa to enter if you’re a US citizen, other visitor’s need the same documents as the US requires for entry.
Puerto Rico Weather
Puerto Rico Weather (Climate Info), Puerto Rico Travel Guide and Online Tourist Information