Sint Maarten — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of Sint Maarten. Learn about today’s conditions, monthly averages, and how the surrounding seas and oceans vary by season. We find every place where you can swim and show you the water temperature there today and throughout the year.
Sea Water Temperature Along the Coast
Chart of Average Temperature Changes Over the Last 60 Days
Places with the Warmest Sea Water Today
The Most Popular Seaside Places
Coastal Seas and Oceans
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
Sint Maarten, a Caribbean island, enjoys warm coastal waters throughout the year, making it a popular destination for swimmers and snorkelers. Typical sea temperatures range from about 26–27°C (79–81°F) in the coolest months of December through March, rising to roughly 28–29°C (82–84°F) in late spring and summer, and peaking near 29–30°C (84–86°F) in August and September. Shallow bays and sheltered lagoons can feel slightly warmer on sunny days, while exposed open-ocean areas may be a degree or two cooler. These steady, comfortable temperatures support year-round swimming, recreational boating, snorkeling and diving around coral reefs and rocky outcrops.
Swimming Conditions
Swimming is generally allowed across Sint Maarten’s beaches and is a core part of the island’s tourism and local life, thanks to consistently warm water and many sandy shorelines. However, conditions can occasionally make swimming inadvisable: stormy weather or hurricanes during the June–November season can produce rough surf, strong currents and dangerous rip tides, and heavy rainfall may lead to temporary water-quality advisories near runoff areas. Some beaches provide lifeguards and marked swimming zones; elsewhere swimmers should exercise common-sense precautions such as checking local advisories, avoiding swimming alone, and heeding posted warnings about currents or marine hazards. Overall, the island’s inviting sea temperatures and abundant coastal access make it suitable for swimming most of the year, with caution advised during severe weather or poor water-quality events.