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Key West Water Temperature Guide: Monthly Averages, Seasonal Trends, and Marine Activities for 2026

"Planning a trip to the southernmost point of the continental United States requires an understanding of the unique marine environment that surrounds this subtropical paradise. In Key West, Florida, the ocean is not just a backdrop; it is the center of local culture, recreation, and industry. Whether you are booking a deep-sea charter, planning a snorkeling excursion to the barrier reef, or simply looking to swim at Smathers Beach, the water temperature plays a decisive role in your experience. The marine conditions of Key West are governed by the confluence of the Gulf of Mexico and the Atlantic Ocean, heavily influenced by the warm, fast-mov..."

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