South Florida's beaches are on the brink of experiencing what scientists warn could be the most severe sargassum season ever recorded. Predictions suggest that the seaweed levels could potentially surpass even the historic highs seen in 2025, as reported by the El Nuevo Herald.
In January, NASA satellites observed an amount of sargassum greater than any other January in history, according to Chuanmin Hu from the University of South Florida, a leading expert in satellite monitoring of this phenomenon.
By March, the biomass in the Great Atlantic Sargassum Belt had reached an alarming 19.6 million metric tons, marking a 31% increase from the same period in 2025, when the annual total across the tropical Atlantic hit 50 million tons.
"As a scientist, it's unsettling to witness how in the past two or three years, we've been setting more and more historical records," Hu remarked. "At one point, I thought, 'Well, this is a record,' and three months later, 'Here's another record.'
Economic and Environmental Impact of Sargassum
The effects of this seaweed invasion are already visible on Miami's shores. Last Thursday, three tractors spent over an hour raking the beach at South Pointe Park in Miami Beach, as beachgoers maneuvered around thick piles of seaweed that stained the shoreline waters with a murky brown hue.
At Crandon Park Beach, a crew filming an advertisement had to adjust their camera angles to exclude the heaps of sargassum from their shots.
Miami-Dade County taxpayers shell out approximately four million dollars annually to remove the seaweed from around 17 miles of public beaches, a cost that has steadily increased since 2019 when systematic cleanup operations began.
However, the real cost extends beyond removal. Di Jin, a scientist at the Woods Hole Oceanographic Institution's Ocean Discovery Center, estimates that the tourism and fishing industries in Florida suffer losses around $2.7 billion.
When factoring in indirect effects—such as empty restaurants and unused services—the total approaches $5 billion, with pessimistic projections nearing $10 billion.
Sargassum's Growing Threat to Tourism
"Sargassum has evolved from being a mere environmental nuisance to causing a significant economic and tangible impact," Jin stated.
The scale of the threat is evident when considering that Greater Miami welcomed 28 million tourists in 2024, generating $22 billion in spending, according to the Greater Miami Convention and Visitors Bureau.
The phenomenon is deterring visitors before they even reach Florida. In a Facebook group with more than 17,000 members focused on sargassum discussions, travelers from across the country are contemplating canceling their plans.
Victoria Brosman, a Toronto resident, vowed never to return after her last visit to Bal Harbour. "The photos from that trip remain a stark reminder of why Florida is no longer an option for a simple getaway," she declared.
Brena Watson from St. Louis is now considering Las Vegas or New York instead of Miami. "We don't need that in our lives. A beach vacation should be clean, beautiful, and enjoyable," she said.
The issue is not exclusive to Florida. In 2025, sargassum overwhelmed beaches in eastern Cuba, prompting Cuba to issue a maximum alert for health risks stemming from the decomposition of the algae, which releases toxic gases affecting residents' respiratory health.
This year, Florida anticipated the largest sargassum invasion in history from the start of the season, and the latest data confirms that this warning was not exaggerated.
Hu was emphatic about the outlook: "No one can stop the enormous amount of sargassum in the ocean. All we can do is prepare."
Understanding the Sargassum Crisis
What is causing the increase in sargassum in Florida?
The increase in sargassum is likely due to a combination of factors, including nutrient runoff from the Amazon River, ocean currents, and climate change, which creates favorable conditions for sargassum growth.
How does sargassum affect local economies?
Sargassum affects local economies by deterring tourists, which reduces revenue for hotels, restaurants, and other businesses. Additionally, the cost of removing the seaweed from beaches adds financial strain to local governments.
What health risks are associated with sargassum?
Decomposing sargassum releases hydrogen sulfide, a toxic gas that can cause respiratory issues, irritation of the eyes, and nausea, particularly in high concentrations.