When is sargassum season in Cozumel?

Sargassum is heaviest in Cozumel from May through August, and mostly on the east coast. The clearest stretch is November through April.

What is the best time to visit Cozumel to avoid seaweed?

November through April is the best window for clear water in Cozumel.

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Does Cozumel Get Sargassum?

Mexican Caribbean · Mexico

Yes — Light in season

Cozumel's west coast, where the town, cruise piers, beach clubs and reefs are, stays largely clear. The wild east coast collects sargassum from spring through summer.

Sargassum in Cozumel by month

Jan

Light

Feb

Light

Mar

Light

Apr

Light

May

Moderate

Jun

Moderate

Jul

Moderate

Aug

Moderate

Sep

Light

Oct

Light

Nov

Light

Dec

Light

LightModerate

Worst months

May through August, and mostly on the east coast

Clearest water

November through April

What to know before you book

•The rule is simple: west coast good, east coast exposed. Everything a cruise passenger or resort guest normally does - the piers, Chankanaab, Money Bar, Paradise Beach, Playa Palancar - is on the sheltered western shore.
•Diving and snorkeling are essentially unaffected. The famous reefs (Palancar, Santa Rosa, Columbia, Colombia Shallows) are along the southwest drop-off in the lee of the island, and sargassum is a surface and shoreline problem, not a reef-depth one.
•If you rent a scooter or jeep to circle the island, the east-coast beach bars are where you will see sargassum in season - budget the visit for the view and the food rather than for swimming, which is dangerous there anyway because of the surf and rip currents.
•State monitoring in 2026 repeatedly listed western Cozumel among the better-conditioned zones in Quintana Roo even while Playa del Carmen and Tulum were flagged excessive on the same day.
•Cozumel is the standard escape valve from Playa del Carmen: the ferry is about 45 minutes, so a bad sargassum week on the mainland can be rescued with a day trip to the leeward coast.

Sources: Sunset Cozumel - Sargassum in Cozumel, 2026, Excelsior, Aug 2026, USF Optical Oceanography Lab, Sargassum Outlook Bulletin #8, Aug 2026, Red de Monitoreo del Sargazo (sargazo.info)