Blue Star Dive Center Key Largo

The Florida Keys form a long chain of islands beginning near the southern tip of Florida and curving southwest toward Key West and the Dry Tortugas, which lie about 70 miles west of Key West. The islands are composed largely of limestone and ancient reef material, reflecting a geological history shaped by changing sea levels.

Stretching nearly 220 miles, the Florida Keys include roughly 1,700 islands, although many are small and uninhabited. Only a portion are connected by bridges. With the Atlantic Ocean on one side and Florida Bay on the other, the Keys are surrounded by an extensive marine environment of coral reefs, seagrass beds, mangroves, and shallow coastal waters.

 The Florida Keys enjoy a warm, subtropical maritime climate influenced in part by the surrounding waters and nearby Gulf Stream. Winters are generally mild, with daytime temperatures commonly reaching the mid-to-upper 70s°F and cooler evenings in the 60s°F. For much of the rest of the year, daytime temperatures regularly climb into the 80s°F and above.

Diving conditions vary throughout the year. Winter cold fronts can bring stronger winds and rougher seas, particularly along the outer reefs, and many divers prefer a wetsuit as water temperatures cool. Summer typically brings warmer water and periods of calmer seas, although thunderstorms and larger weather systems can temporarily change conditions.

The Florida Keys are also within the Atlantic hurricane belt. Hurricane season officially runs from June 1 through November 30, with activity generally highest from late summer into the fall. As with any ocean destination, daily diving conditions ultimately depend on the weather, wind, and overall ocean state.

 Water movement throughout the Florida Keys is strongly influenced by the nearby Gulf Stream. Because its position and strength can vary, current conditions on the reefs are not always predictable. A dive site that has noticeable current one day may have very little the next day, and the direction of the flow can change as well.

Conditions are often more moderate within Hawk Channel, the stretch of water between the Keys and the offshore reef tract. Stronger localized flow can occur around channels and passes as tides move water between Florida Bay and the Atlantic. Tidal changes themselves are relatively small in the Keys, with the difference between high and low tide generally less than two feet.

 Visibility in the Florida Keys can vary with weather, tides, and water movement. Conditions are often especially good along the outer reef tract, where clear ocean water circulates through the area. Calm days generally bring the best visibility, while stronger winds and rougher seas can stir up the water, reducing underwater visibility and creating more surface chop. 

 Scuba diving in Key Largo is available throughout the year, with each season offering slightly different conditions. Spring and summer typically bring warmer water, longer stretches of calm seas, and excellent opportunities to explore Key Largo’s reefs and wrecks. Water temperatures during the warmer months commonly reach the low-to-mid 80s°F.

During the winter, water temperatures are cooler and passing cold fronts can occasionally bring stronger winds.  Late summer and fall remain warm, but they also coincide with Atlantic hurricane season, so weather conditions can be more variable.

There really isn’t one “perfect” month to dive Key Largo. Visibility, currents, and sea conditions can change from day to day, but with warm subtropical waters and a wide variety of dive sites, Key Largo offers great diving opportunities in every season.

Just offshore of the Florida Keys lies an extensive coral reef ecosystem and one of the features that makes diving in this region so unique. Southeast Florida is home to the largest coral reef ecosystem in the continental United States. 

The reef is made up of a diverse collection of habitats where hard and soft corals, sea fans, and sponges provide shelter and feeding grounds for marine life. Elkhorn, staghorn, brain, and star corals are among the species found here, alongside sea turtles, sharks, moray eels, groupers, snappers, jacks, and an enormous variety of smaller reef inhabitants.

Like coral reefs around the world, Florida’s reef faces considerable environmental pressures. Rising ocean temperatures, coral disease, changes in water quality, coastal development, invasive species, and other human impacts have contributed to the loss and degradation of coral throughout the region.

Diving and snorkeling can place additional pressure on sensitive reef environments, which is why following responsible practices and taking care to avoid damaging coral are so important. By enjoying the reef responsibly today, we can help protect it for future generations. 

 Mangroves are an important part of the Florida Keys, with red, black, and white mangroves lining many of the islands and waterways. Their extensive root systems provide food, shelter, and nursery habitat for fish, birds, and a wide variety of wildlife. At Sail Fish Scuba, our trip to the reef begins along a mangrove-lined channel before reaching the open ocean.

Mangroves also help stabilize shorelines, trap sediment, reduce erosion, and provide protection from waves and storms. Together with seagrass beds and coral reefs, they form an interconnected ecosystem that supports marine life throughout the Florida Keys.

 The Florida Keys are home to large seagrass beds that play an important role in the marine environment. Turtle grass, shoal grass, and manatee grass provide food and shelter for sea turtles, manatees, crustaceans, and many species of fish. Young fish also use these grassy areas as a place to feed, grow, and find protection.

Seagrass beds also help keep the water clear by holding the sandy bottom in place and trapping sediment. Like plants on land, seagrasses absorb carbon dioxide and produce oxygen, making them an important part of a healthy marine ecosystem.

Protecting seagrass beds is an important part of conserving the Florida Keys marine environment. These habitats support countless marine species and are closely connected to the health of the surrounding reefs and coastal waters.