Puerto Rico — Sea Water Temperature and Annual Ranges

Sea Water Temperature Along the Coast

Places with the Warmest Sea Water Today

The Most Popular Seaside Places

Coastal Seas and Oceans

Water Temperature and Swimming Overview

Water Temperature Trends

Puerto Rico’s coastal waters are characteristically warm year‑round, making swimming a common activity for residents and visitors. Average sea temperatures typically range from about 25–26 °C (77–79 °F) in the coolest months of January and February to roughly 29–30 °C (84–86 °F) in the warmest months of August and September. Variations around the island are modest: the Caribbean‑facing south and the sheltered bays tend to feel slightly warmer and calmer, while exposed northern beaches can be a bit cooler and more affected by Atlantic swells during the winter months.

Swimming Conditions

Swimming is generally allowed and widely enjoyed because the water temperatures are comfortable for most people throughout the year. Many public beaches are monitored by lifeguards and support recreational activities such as snorkeling, diving, and casual swimming. However, conditions can make swimming unsafe at times: seasonal rip currents, strong surf on exposed shores, occasional jellyfish or sargassum seaweed influxes (more common in summer and fall), and tropical storm or hurricane threats during the June–November season can close beaches or advise caution. Visitors should heed local warnings, observe posted flags, and choose protected coves or lifeguarded beaches if unsure. Overall, Puerto Rico’s warm coastal waters and diverse shoreline offer abundant opportunities for swimming almost any time of the year, provided typical ocean safety precautions are followed.