Boasting temperate waters and more than 3,400 hours of annual sunshine, the beaches of Key West are some of the most popular destinations on this tropical island paradise. You can enjoy the sun, sand and warm water as well as a variety of activities like swimming, snorkeling and fishing.

Yes, the beaches in Key West are swimmable, but they are different from the wide, sandy stretches found in Miami or the Gulf Coast. Most of Key West's beaches are "man-made" and protected by an offshore reef, which means the water is very calm but the sand can be "rocky" or coral-heavy. Smathers Beach is the longest and most popular for traditional swimming and sunbathing. Fort Zachary Taylor State Park is widely considered to have the best and clearest water for swimming and snorkeling, though water shoes are highly recommended due to the rocky bottom. A "high-fidelity" concern in 2026 is water quality; the Florida Department of Health monitors beaches for enterococci bacteria, and swimming advisories are occasionally posted after heavy rains or due to sargassum (seaweed) buildup, which can cause skin irritation. Generally, the water is warm and safe, but visitors should always check the "Healthy Beaches" status or look for local warning flags regarding "Red Tide" or bacterial levels before diving in.