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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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.
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.
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.
Sargassum is at its worst between April and August, peaking in July and August, although this year saw the seaweed arrive early, with some beaches being hit heavily in March. What is this?
While exposed eastern shores are most likely to get hit by surges of sargassum, some beaches in Mexico have no sargassum. This includes Playa Norte on Isla Mujeres, Quintana Roo and Cozumel's western shore. They're generally seaweed-free. However, much depends on winds and ocean currents.
A 5,000-mile-wide blob of seaweed is headed for Florida, threatening tourism across the Caribbean. “This is an entirely new oceanographic phenomenon that is creating such a problem — really a catastrophic problem — for tourism in the Caribbean region where it piles up on beaches up to 5 or 6 feet deep,” Lapointe added.
But already, sargassum beachings are increasing, with the southern regions of Hispaniola, Jamaica and Puerto Rico looking likely to be the most impacted. The Great Atlantic Sargassum Belt is the largest macroalgae bloom in the world, and this year's bloom is the largest recorded, spanning more than 5,000 miles.
Playa Porto Mari on Curacao, Dutch CaribbeanOne of the most beautiful beaches in Curacao also happens to be one of the best Caribbean beaches without sargassum. Located on the west coast of the island of Curacao, Playa Porto Mari is a private beach which means there is an entrance fee.
Popular resort hubs, including Playa del Carmen and Tulum, have ramped up efforts to deter sargassum from affecting travelers. What is this? Both destinations have set up temporary barriers and hired more cleaners in an effort to attract more travelers.
Additionally, beaches on Florida's east coast, including Palm Beach, Fort Lauderdale, and the Miami Beach area, are also seeing mounds of sargassum wash ashore. According to a report from AccuWeather, it is also impacting the southern regions of Hispaniola as well as areas of Jamaica and Puerto Rico.
The seaweed, which smells like rotten eggs and emits toxic gases when it comes ashore, proved a nuisance for Florida beachgoers in the spring – which is also the start of the Sunshine State's tourist season.