Yes, the water in St. Kitts and Nevis is warm year-round, typical of a tropical Caribbean climate. In February 2026, the average sea temperature is approximately 26°C (79°F). This is generally considered the "coolest" the water gets all year, as temperatures rise to a peak of about 29°C (84°F) in September and October. At 79°F, the water is comfortable for extended swimming, snorkeling, and diving without a wetsuit for most people. The islands' position ensures that the Caribbean Sea on the western side is calmer and feels slightly warmer than the Atlantic Ocean side, which can be breezier. Because of the consistent warmth, St. Kitts remains a premier "winter sun" destination, where the water temperature is often warmer than the air temperature at night, making it ideal for the various aquatic festivals and regattas held in the early part of the year.