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Mark Kilpatrick September 20, 2026

Sargassum Seaweed Beach Report (Updated: September 2026)

Sargassum Report September 2026: Cancún and Riviera Maya Beach by Beach, Plus the Christmas Forecast

Updated September 20, 2026

Good news first. The worst is over. 🌊

The 2026 sargassum season was brutal. But the seaweed is now retreating, and it is retreating fast. Here is what each beach looks like right now, with real photos from people on the ground. Then we look ahead to Christmas and New Year.

The Big Picture

The numbers tell the story.

✅ Floating sargassum across the Atlantic fell to about 12.5 million tonnes in August. That is half of July and 63% below the June peak.

✅ Off the Riviera Maya, satellite coverage dropped from 25.6% to 19.8% in 1 week. The seaweed still approaching from upstream fell from 10.4% to 2.0%.

✅ Today’s monitoring network report shows 50 northern beaches at low levels and 3 completely clear.

It was still a record year on the sand. Quintana Roo removed 124,852 tonnes between April and August. The state is now approaching 128,000 tonnes for the year. Hotels spend up to 30 million dollars a year fighting it.

The problem has the world’s attention too. On October 1 and 2, Cancún hosts the 4th European Union-Caribbean conference on sargassum.

So the cleanup crews earned this break. Now, where should you swim?

Beach-by-Beach Conditions

Ratings come from the weekly conditions report for September 14 to 20. Conditions change daily, so always check a live webcam the morning you go.

🟢 Isla Mujeres (Playa Norte): Clear

This is the best beach on the coast right now. Playa Norte stays essentially clear all week, shielded from the Caribbean swell. It stayed largely clear even during the worst weeks of summer. The ferry from Cancún takes about 15 minutes, so it works as a day trip.

🟢 Cancún Hotel Zone, North Side: Clear

North Cancún stays green virtually all week thanks to its sheltered, north-facing shoreline. Playa Gaviota Azul, Playa Tortugas and the Punta Cancún stretch are clearing fastest.

The drone footage agrees. On September 6, the water by the cubes at Playa Gaviota Azul was transparent turquoise with a clean shoreline.

From https://www.facebook.com/photo?fbid=1983247043036720&set=pcb.3692583390894253

🟡 Cancún Hotel Zone, South Side: Light

Playa Delfines and the southern stretch face the open sea. Some sargassum sits along the shoreline there, but the beach remains easily swimmable and the water beyond the waterline is clear. This side is improving too, just more slowly than the north.

🟡 Costa Mujeres and Playa Mujeres: Light

Light all week. Expect only minor buildup, even when the east wind picks up. This stretch is one of the safest mainland bets in any season.

🟡 Puerto Morelos: Light

The reef does the work here. It holds conditions at Light most of the week, with only a brief bump when Friday’s wind builds. The reef has kept this town calmer than most of the coast all season.

🟠 Playa del Carmen: Moderate, Check Daily

Playa is the most changeable beach on the coast. It runs Moderate most days, eases to Light on some, and can spike to Heavy when the wind turns.

You can see both sides in photos from the same day. On September 12, Nexo Quintana Roo posted clean sand and little seaweed downtown. That same day, drone photos showed the offshore barrier holding a long band of sargassum, and brown water filling the cove at Punta Esmeralda.

The lesson? Walk 10 minutes and the beach can look completely different. Mornings after cleanup are best.

One more tip. Clean sand does not always mean clear water. Rotting seaweed can stain the water a tea-like brown, even after crews clear the beach. Look at the water, not just the sand.

seaweed beach report playa del carmen sept 2026

Image source: https://x.com/nexoquintanaroo/status/2098815062408343929

A local note: Punta Esmeralda’s entrance has been closed since August 31 for about 3 months of upgrades. The city points visitors to Playa 88 instead.

🟠 Tulum: Moderate, Easing to Light

Tulum is a bright spot this month. It runs Moderate most of the week and eases back to Light by Sunday. The head of Tulum’s federal beach zone says the beaches are returning to their natural colors after crews removed 5,600 tonnes in recent months.

Beach clubs south of town feel any wave build first. If the beach looks rough when you arrive, a cenote is 15 minutes away.

📸 [LINK: Recent dated community photos. sargazowatch.com/beach/tulum-zh.html]

🔴 Akumal: Heavy

Akumal is the toughest spot right now. It stays Heavy all week with no real relief in the 7-day view. The sheltered bay has little wave energy to carry seaweed back out, so it lingers.

Need a backup nearby? Yal-Kú lagoon, just north, is brackish water and effectively unaffected by sargassum. Save the turtle snorkel for a few weeks from now.

🟡 Cozumel (West Coast): Light

The island blocks the swell. The west coast holds Light most of the week and even clears briefly. The east side takes the hit, just like the mainland.

🟢 Bonus: Holbox and Bacalar

Two places sit outside the problem. Holbox faces the Gulf, not the open Caribbean, and has had a quiet season. Bacalar is a freshwater lagoon, so sargassum never reaches it. Both are clear-water bets in any month.

Why Do Beaches 20 Minutes Apart Look So Different?

It comes down to 3 things.

✅ Direction. North-facing beaches dodge the current. East-facing beaches catch it head on.

✅ Protection. Reefs, islands and bays break the flow. That is why Puerto Morelos, Isla Mujeres and Cozumel’s west side outperform.

✅ Cleanup. Some stretches get raked at 5am daily. Others do not.

This matters if you are choosing where to stay. It matters even more if you are choosing where to buy.

How to Check Conditions Yourself

Do not trust a single source. Use 3 layers.

✅ Live beach cams. They show the sand right now.

✅ Your hotel’s Instagram Stories. Most post beach photos by 7 or 8am.

✅ Satellite maps. The University of South Florida updates them several times a week.

Add the daily traffic light map from the Red de Monitoreo del Sargazo on Facebook. Together, these give you a solid 24 to 48 hour picture.

The Forecast: October Through New Year 🎄

The outlook is good.

The University of South Florida expects sargassum to keep decreasing in all regions, possibly until November. Beaching will continue, but less severely than in summer.

Esteban Amaro, director of Quintana Roo’s Sargassum Monitoring Network, expects a considerable drop in September and October, and minimal arrivals in November and December. He adds that hurricane season tends to push sargassum away from the coast.

Here is our read, month by month:

✅ October: Mostly Light to Clear in Cancún and the islands. Expect the odd Moderate day between Playa del Carmen and Tulum after strong east winds.

✅ November: Usually the cleanest transition month. Last year, total sargassum fell from 4.3 million tonnes in October to 1.7 million in November.

✅ Christmas and New Year: Expect clean beaches in Cancún, Costa Mujeres, Isla Mujeres, Puerto Morelos and Cozumel. Playa del Carmen should be mostly clean. Tulum and Akumal carry a small leftover risk. Tulum still saw seaweed on some December days last year because of ocean currents.

One Honest Caveat

Early 2027 is the question mark. Unusual winter surges hit Playa del Carmen and Tulum in January and March 2026. Amaro warns that 2027 arrivals could again start as early as January.

So the holiday window looks strong. Late January in Tulum is harder to promise. No forecast this far out is a guarantee. Treat it as odds, not a promise.

How to Check Conditions Yourself

Do not trust a single source. Use these layers together.

🎥 Live cams and daily photos

✅ Sargazo Watch live beach cams. Over 170 cameras across the region.
✅ Sargazo Watch: Where to Swim Today. A plain daily list of clear beaches and ones to skip, based on fresh photos.
✅ Sargazo Watch drone footage. New dated flights every week.

🗺️ Live maps and forecasts

✅ How Is The Sargassum live map. Status for 10 beaches, updated hourly.
✅ How Is The Sargassum 7-day forecast. Days 1 to 3 are reliable. Days 4 to 7 show the trend.
✅ Sargassum Monitoring: Riviera Maya 4-day outlook. Forecast maps plus citizen reports.
✅ Sargassum Report: Riviera Maya. Daily risk levels by region.

🛰️ The science

✅ University of South Florida Sargassum Watch System. Satellite images and the monthly outlook bulletin that everyone else quotes.

👥 Local reports on social media

✅ Red de Monitoreo del Sargazo de Quintana Roo on Facebook. The daily traffic light map for about 100 beaches.
✅ Sargazo Watch on Facebook. Daily regional summaries.
✅ Sargasso Seaweed Updates Riviera Maya Facebook group. Travelers post beach photos and videos every day.
✅ Sargassum Monitoring on X. Alerts when new reports hit the map.

One last tip. Check your hotel’s Instagram Stories. Most post a beach photo by 7 or 8am.

Together, these give you a solid 24 to 48 hour picture.

Per-beach live links

Add one line under each beach heading:

Sources and Photo Credits (linked version)

Quick Answers

Is there sargassum in Cancún right now?
Very little on the north side. The south side has light amounts and stays swimmable.

Which beach is cleanest today?
Playa Norte on Isla Mujeres, followed by north Cancún.

Will the beaches be clean for Christmas?
Most likely, yes. Experts expect minimal arrivals in November and December. Tulum and Akumal carry the most risk.

Is sargassum dangerous?
Fresh seaweed in the water is harmless, just unpleasant. The bad smell comes from seaweed that has rotted on hot sand for a day or more.

What if my beach is covered?
Go inland. Cenotes have no sargassum at all. Or hop a ferry to Isla Mujeres or Cozumel.

What This Means If You Are Thinking of Buying Here

Sargassum is now part of life on this coast. Smart buyers plan for it.

✅ Ask which way the beach faces.
✅ Ask if a reef or barrier protects it.
✅ Ask who cleans the beach, and how often.
✅ Ask what the building spends on cleanup, and who pays.
✅ Visit in person before you decide.

We work only for buyers. We never represent developers or sellers. So we will tell you the truth about any beach, building or neighborhood, including the seaweed.

Want to compare locations? Browse Tulum listings here. Our site shows only part of the market. As buyer’s agents, we can access every listing in the region.

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