Is there a big seaweed coming to Florida?

A giant blob of seaweed called the Great Atlantic Sargassum Belt is floating toward the West Coast of Florida in the Gulf of Mexico. The mass, pictured in the map below, could be an estimated 13.5 million metric tons in 2023 and is known as sargassum. What is that, and what happens as it reaches the coast?



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Florida's seaweed season typically runs from April until October, peaking in June and July. The seaweed comes in waves, depending on currents and wind direction. The seaweed itself is not harmful to humans, but decaying sargassum on beaches releases hydrogen sulfide that can impact people with breathing issues.

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The huge blob of seaweed headed for Florida has shrunk by 75% Beachgoers walk past seaweed that washed ashore on March 16, 2023 in Fort Lauderdale, Florida. Florida vacations are back on, sans stinky seaweed.

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no matter how much Sargassum we'll land on the east coast beaches, the west coast of Florida is largely spared every year [and] this year is no exception, Dr. Hu says. Nevertheless, they still anticipate there will soon be an impact on beaches in South Florida where the brown seaweed washes ashore.

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Since 2011, 2023 still ranks in the top half of the worst sargassum seaweed seasons. With the latest data, USF researchers say in June, sargassum will likely decrease in the Gulf of Mexico, meaning beachgoers may not have such a smelly experience. The USF lab forecasts the decrease to continue through August.

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In Florida, barrier islands like Miami Beach and West Palm Beach tend to get the worst of it because they jut out closer to the Gulf Stream. But Atlantic beaches in states to the north also could see seaweed.

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2023 is shaping up to be a banner year for sargassum, a type of brown macroalgae now starting to wash up on beaches across the Caribbean. The thick dead tangled heaps of seaweed stink like rotten eggs and could cost many millions in holiday revenues this summer.

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Sargassum season in the Mexican Caribbean typically runs from May through October, with July and August generally being the worst months for its arrival.

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In Mexico, sargassum seaweed season is generally between May and October each year. If you travel to the Caribbean coast of Mexico outside of that time period you can generally avoid large mats of seaweed on the beaches. Cancun to Tulum seaweed map in March 2022.

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7 September 2023 Update: The Turks and Caicos is experiencing medium levels of sargassum at this time. Grace Bay, Leeward Beach, Sapodilla Bay, Taylor Bay, and the Bight Beach remain largely free of sargassum. Sargassum that washed onshore in late August has largely dissipated.

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It will most likely impact south Florida, but researchers do not believe the impact will be as large along Florida panhandle beaches. They will continue to monitor and report on the movement of this mass of seaweed over the course of the summer.

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