Why are the beaches in Mexico full of seaweed?

They are washed up by currents from the Sargasso Sea, a sea between Europe and America, in which many brown algae grow. Due to these currents, brown algae are washed towards Mexico and the Caribbean, especially in the summer months.



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If you want to avoid the seaweed and still enjoy sea and sand, then don't worry. Thanks to their location, the islands of Holbox, Isla Mujeres and Cozumel all have west-facing beaches that are either relatively or completely sargassum-free.

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What time of year is seaweed bad in Cancun? The amount of sargassum seaweed in Cancun varies by season and even daily. Generally the worst months for seaweed are July and August.

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From April to September, the Caribbean sea's turquoise waters change hues due to the presence of seaweed. If you want to dip into sargassum-free beaches, the best season is from October to May.

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Escape the 'blobs:' These beaches in Cancun have little to no seaweed
  • Isla Contoy. “Spanning just five miles long, the island's pristine white sand, untouched by sargassum, stands as its undeniable centerpiece, drawing visitors in with its sheer beauty. ...
  • Playa Tortugas. ...
  • Isla Mujeres Playa Centro. ...
  • Isla Mujeres - Punta Sur.


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? Avoid touching or swimming near seaweed to avoid stinging by organisms that live in it. ? Use gloves if you must handle seaweed. ? Stay away from the beach if you experience irritation or breathing problems from hydrogen sulfide—at least until symptoms go away.

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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.

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The Pacific Coast is sargassum-free, and in parts of Mexico's Caribbean Coast, the impact varies. For example, the resorts of Cozumel and Isla Mujeres have shown small to virtually no signs of sargassum this year.

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The beaches in Playa del Carmen experience a seasonal seaweed influx that can change throughout the year. While efforts are being made to address the situation, visitors should know that the seaweed may impact their beach experience.

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Aids are so-called algae barriers. They prevent the seaweed from getting anywhere near the beaches. These barriers have been set up in front of the beaches around Playa del Carmen, Cancun and Tulum and are now increasingly being used on other beaches.

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In Playa del Carmen, the most affected beaches are Playacar Ferry, Playacar ZH Fase1, and Playa El Recodo. Most beaches in Cancun have low levels of sargassum.

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Sargassum seaweed is a type of macroalgae that forms over the Atlantic Ocean each year in large quantities. The foul-smelling but harmless seaweed is a perennial issue for Caribbean destinations like Cancun, which see huge quantities of the macroalgae wash up on their shores yearly.

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Top Tip: Punta Esmeralda is a curved bay sheltered from the open sea, and thus receives less sargassum seaweed than other beaches in Playa del Carmen. If you're visiting during the sargassum season, which runs roughly from April to August, this might be the best place to swim in seaweed-free water.

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Short Summary. Cancun is generally safe for travelers but take necessary precautions and take government website travel alerts into consideration. Follow safety tips like avoiding walking alone at night and sticking to well-known establishments.

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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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