On the Caribbean coast of Mexico, the sargassum seaweed season began immediately at the beginning of the year, rather than traditionally in the spring months, local ecologists and monitoring services report. This year, the first significant accumulations of Sargassum algae on the beaches were recorded in January, and in several municipalities at once — from the northern part of Cozumel to Tulum, Puerto Morelos and Playa del Carmen, as well as in the southern regions, including Xalac and Mahahual. Professionals consider such an early appearance of algae to be atypical. Many travelers arriving in January are already reporting noticeable algae accumulations on beaches, something that has not previously occurred during this period. Thus, on Thursday, January 8, 2026, an unusually large accumulation of Sargassum algae was observed on Mamitas Beach in Playa del Carmen — about 25 tons at once.
So far, along hundreds of kilometers of beaches, sargassum is found only in fragments, but the early start of the season is perceived as an alarming signal. In past years, the massive arrival of algae traditionally began in April-May, peaking in summer and fall, and then tapering off by October-November.
Researchers cite changes in ocean currents, fluctuating water temperatures and increases in nutrients that encourage the proliferation of macroalgae as reasons for the early and abundant appearance of algae on Mexican beaches. These factors are associated with both climate change and natural processes in the Atlantic Ocean, where sargassum forms a huge belt — The Great Atlantic Sargassum Belt stretches thousands of miles from the coast of West Africa to the Caribbean.
Alerta en Playa del Carmen: el sargazo se adelanta y sorprende a turistas con un recale masivo e inusual: Las autoridades de Quintana Roo desplegaron un operativo de emergencia en Playa Mamitas tras la llegada de 25 toneladas de la macroalga fuera de…t.co/0OV0wqI6O8pic.twitter.com/3CyvDia56O
— Debate (@ELDEBATE)January 9, 2026
Satellite monitoring shows that the total volume of sargassum masses in the Atlantic has been consistently high in recent years: in 2025, according to estimates from the University of South Florida, it reached about 37-38 million metric tons, significantly exceeding previous records. Experts noted in their forecast that early cases of algae blowouts on the coast are considered unusual, could continue in the coming months, and 2026 is likely to be another «record» year for Sargassum algae, based on how much algae is already present in the ocean regions they monitor. There may be weeks of perfectly clean beaches, and then a change in sea currents will suddenly present an unpleasant surprise.
Sargassum, floating along coasts and onto beaches, creates not only an aesthetic problem, but also has a significant impact on tourism, ecology and the economy. Large accumulations of algae on beaches interfere with swimming and reduce the attractiveness of vacation spots, cause an unpleasant odor during decomposition, which scares away guests, and increase the cost of cleaning and maintaining beaches.
Sargassum seaweed outbreaks have been observed annually throughout the Caribbean since 2011, but have increased in size and duration over the past decade. Scientists attribute this to changes in ocean currents, increased vertical mixing of nutrient waters and climate variations that create favorable conditions for algae growth.
The early appearance of sargassum in 2026 coincides with global trends in which warm surface waters, changing winds and other factors mean the season is less predictable and has the potential to be delayed or start earlier than usual, making planning difficult for the tourism industry and municipal services.