Caribbean Beaches Could See Record Sargassum This Summer

Caribbean beach destinations are entering the summer travel season as scientists warn that 2026 could be one of the heaviest sargassum years on record. According to TravelPulse, researchers expect June to bring another record month for the red-brown seaweed, which grows in thick floating mats across warm ocean waters and can wash ashore from Florida to the Mexican Caribbean. The University of South Florida Optical Oceanography Laboratory, which monitors sargassum through satellite data, reported that total amounts continued to increase in most regions in May.

The lab said every monitored region except the West Atlantic showed record-high sargassum for the month. Major beaching events have already been reported around the Caribbean and Lesser Antilles, as well as along the Florida Keys and Florida’s east coast. The warning points to a summer of uneven beach conditions across the region, with currents, wind, shoreline direction and local cleanup capacity shaping how much sargassum reaches each resort area.

Scientists Say Sargassum Could Keep Increasing Through June

The latest University of South Florida sargassum outlook, dated May 31, said the amount of sargassum in most regions is likely to increase in June. The bulletin also said beaching events around the Caribbean and southeast Florida will continue and likely increase, with some beaching events possible along the coasts of Louisiana and Texas.

The lab noted that three large sargassum masses remained visible in May. One affected the western Caribbean, another the eastern Caribbean, and a third the western Atlantic. The transport of sargassum into the Gulf region also continued, setting a record high for this time of year.

The University of South Florida said 2026 is set to be another major sargassum year, meaning the amount exceeds 75% of historical values. It added that the year could become a record year by summer 2026. That forecast adds pressure on destinations that depend heavily on beach tourism, especially resort areas where visitors expect clear water and clean shorelines during peak vacation months.

What Travelers Should Check Before Booking

Travelers planning Caribbean beach trips should treat sargassum as a local beach issue, not a single regional condition. The University of South Florida warns that its bulletin provides a general outlook and should not be used to predict conditions at a specific beach. One resort area may see heavy seaweed while another nearby stretch of coast remains clearer.

Before booking, travelers should check recent resort updates, tourism board notices, live beach cameras, and current traveler photos from the exact beach they plan to visit. The NOAA Daily Sargassum Inundation Risk tool also provides daily coastal inundation risk information for the Caribbean and the Gulf of America region.

Health concerns may also affect travel decisions. The U.S. Environmental Protection Agency says sargassum can harbor organisms that may irritate skin. When it decomposes on land, it can produce hydrogen sulfide and ammonia, which may cause respiratory, cardiovascular, and neurological effects. The EPA says children, older adults, and people with asthma or other health conditions may face a higher risk.

Travelers should ask hotels how often beaches are cleared, whether offshore barriers are in place, and whether the property offers alternate pools, excursions, or beach access when seaweed is heavy. Flexible booking terms may also help, since sargassum conditions can change close to departure and travel insurance may not automatically cover cancellations tied to seaweed.

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