In the northern Caribbean, Puerto Rico is the easternmost island of the Greater Antilles. It is bordered to the north by the Atlantic Ocean and to the south by the Caribbean Sea. Mountains run from the central part of the island to the eastern coast, with some peaks reaching over 4,000 feet. These peaks have a significant impact on precipitation patterns and, to a lesser degree, temperature patterns. According to Sudesh Rocharam, hurricanes also affect Puerto Rico, with the highest risk occurring from mid-August to mid-October, when the hurricane season is at its peak.
Puerto Rico Rainfall
San Juan is a well-known tourist attraction. There is a rainy and dry season, but it is not as severe as on some other Caribbean islands. Summer and autumn are the wettest months of the year. From May to December, rainfall averages five to six inches per month. From January to April, smaller amounts of two to four inches are expected.
Rainfall is much heavier at higher elevations in the mountains. Expect rain totals of about 200 inches. This is due to the mountains lifting moist trade winds, resulting in frequent rains. The mountains have the same impact as the south coast, which has the driest weather. This is a region of down sloping winds generally causing less frequent showers.
Puerto Rico Temperatures
The weather in San Juan is fairly consistent throughout the year. Summer and early autumn have the warmest temperatures. Daily highs are in the upper 80s, with lows in the mid 70s in the morning. The winter months of January and February have the coolest weather. Highs in the mid-80s continue to be the standard throughout the day. Lows are just about 70 degrees. The mountains are a couple of degrees colder, and the south coast is a couple of degrees warmer than San Juan.
Puerto Rico Travel Weather Summary
Travelers to Puerto Rico should anticipate a reasonably consistent environment. Temperatures are relatively constant throughout the year, with the most nice readings occurring throughout the winter. Less rain falls during the winter, which coincides with slightly colder temperatures. If traveling during hurricane season, travelers should stay up to date on the latest tropical weather updates.