Sargassum Season in Cancún & the Riviera Maya — 2026 Guide
Updated June 21, 2026 from Copernicus satellite data — refreshed 4× per day.
Planning a Riviera Maya trip and worried about sargassum and seaweed? Here's the honest 2026 picture — when the seaweed arrives, when the beaches stay clean, and how to time your trip. Short version: November through March is reliable and clean; the Atlantic belt arrives April through October, heaviest May to August. If your dates are flexible, that single fact plans the trip.
November – February
The reliable window. Landings are rare and light, the Atlantic is at its annual minimum, and almost the entire coast — Cancún to Tulum — stays clean for weeks at a stretch. If avoiding sargassum is your priority, travel in these months.
March
The warning month. Satellites start picking up the first mats of the new bloom crossing the Atlantic. Beaches are mostly still clean, but stray patches can land on the open coast. Worth a glance at the map before you book tours.
April
The season kicks off. Landings become regular on the east-facing beaches — Playa del Carmen, Tulum, Xpu-Ha — though still at moderate volumes that crews handle in the morning. Isla Mujeres, Holbox and west Cozumel stay quiet.
May – July
The peak. The Atlantic sargassum belt delivers steady volume and the open coast can wake up buried several times a week. The gap between beaches becomes enormous: on the same day, Delfines can be brown and Palancar crystal-clear. This is when a per-beach forecast is worth its weight in gold.
August – September
Still strong but easing. Landings turn episodic: a beach can be covered Tuesday and raked clean by Friday. Hotels keep up the cleaning pace and sheltered beaches recover fast. The 7-day radar helps you dodge the pulses.
October
The tail of the season. Volumes drop week by week and by month's end most beaches are stably clean again. A late pulse can sneak in after a norte, so the cautious keep checking the map — but the odds are firmly in your favor.
Booking tips
If your dates are flexible, book November through March and forget about seaweed. Traveling in peak season? Favor staying on Isla Mujeres, Holbox or the west side of Cozumel — or, in the corridor, pick a resort with daily cleaning and an offshore barrier. Check our map the week before you fly (last month's forum posts are useless), and once you're here, plan beach mornings and keep a cenote or a Cozumel day as your plan B for the heavy days.
Live Seaweed & Sargassum Map — Cancún and the Riviera Maya · Sargassum Forecast for Cancún & the Riviera Maya — Next 7 Days · Beaches Without Sargassum Today in Cancún & the Riviera Maya · Best beaches without sargassum · Sargassum this week · Methodology & accuracy · Live map
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