Cayman Islands — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of Cayman Islands. 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
The Cayman Islands enjoy some of the warmest and most stable coastal water temperatures in the Caribbean, making the sea attractive for swimming most of the year. Typical sea surface temperatures range roughly from 24–30 °C (75–86 °F). In the cooler months of December through February, coastal waters usually sit around 25–27 °C (77–81 °F). Spring and early summer (March–June) bring a gradual warming into the upper 20s °C (78–83 °F). The warmest period is midsummer into early autumn (July–October), when water can reach about 28–30 °C (82–86 °F). Slight short-term variations occur with seasonal weather patterns; passing cold fronts in winter or strong winds during the hurricane season (June–November) may lower surface temperatures a degree or two and create choppier conditions.
Swimming Conditions
Swimming is broadly permitted and popular around Grand Cayman, Cayman Brac, and Little Cayman because the waters are warm, clear, and generally hospitable to recreational use. Public beaches and resort areas are set up for swimmers, and snorkeling and diving are major attractions because of extensive coral reefs and good visibility. Caution is advised during and after storms when currents, waves, and marine debris can pose hazards, and lifeguard presence varies by beach. Additionally, protection of coral and marine life is important—swimmers should avoid touching reefs and be mindful of occasional jellyfish or sargassum. Overall, the warm sea temperatures and well-developed beach access make the Cayman Islands a reliable destination for swimming throughout the year.