Hurricane season, decoded
June through November scares more travelers than it should — and burns the unprepared ones. The real odds by month and map position, the insurance rule, and when the discount is worth it.
The brown tide that can turn a postcard beach into a compost pile — which coasts it hits, which months, which resorts cope best, and how to check before you book.
Sargassum is a free-floating ocean seaweed that has always drifted around the Atlantic — what's new is the scale. Since roughly 2011, a recurring belt of it blooms across the tropical Atlantic and rides the currents west into the Caribbean, and in a heavy influx year an east-facing beach can go from postcard to compost pile in a weekend. It's harmless to swimmers in normal amounts, but a thick landing smells like sulfur, browns the shorebreak, and buries exactly the sand you booked five months ago.
The honest frame: sargassum is weather, not a defect. It varies by year, by month, by coast, and — crucially — by individual beach. The same week that buries one resort can leave its neighbor two coves west nearly clear. That's why we track it per property rather than repeating a country-level rumor.
Geography first, because it's the strongest lever you have. Sargassum is an Atlantic/Caribbean phenomenon: the exposed east-facing coasts catch it — Mexico's Caribbean side (Cancún through Tulum), Punta Cana's east-facing strands, the Atlantic sides of many islands. Sheltered and lee shores do better: Jamaica's north coast is usually lightly affected, Grace Bay in Turks & Caicos faces north and stays clear most of the year, and islands' west coasts (Barbados, Curaçao) see notably less than their Atlantic sides. And entire seas opt out: Mexico's Pacific coast (Los Cabos, Puerto Vallarta), the Mediterranean, the Maldives and the rest of the Indian Ocean never see it at all.
Season second: influxes typically run April through August, tapering into fall, with winter usually the clearest window. But 'typically' is doing real work in that sentence — heavy and light years alternate on no schedule anyone can promise, and conditions shift week to week within a season. Treat seasonal notes as odds, not guarantees.
Good resorts fight the landing hard: dawn raking crews, tractor sweeps, offshore barrier nets at the best-positioned properties, and — at the top end — real-time rerouting of beach service to the cleaner stretch of sand. Bay-positioned and barrier-equipped resorts genuinely fare better than open-coast neighbors in the same week. What no resort can do is stop the ocean; in a serious influx, the pool becomes the swim and the resort that also has great pools suddenly earns its keep.
This is exactly the difference between a one-star review and a fair one: 'seaweed ruined our beach' in a July influx week says less about the resort than about the booking. The resort-level questions that matter — does this beach catch it, which months, does the property rake and barrier — are answerable before you pay a deposit.
On this site, the work is done per property: each researched resort page's beach section shows a sargassum rating (rare / seasonal / frequent — or 'not applicable' outside the Atlantic belt) with the typical months, alongside the swimmability read. Browsing, the 'Low seaweed risk' filter on the resort list and the 'Low seaweed' toggle on the map show only resorts where the answer is verified good. The destination guides carry the coast-level story — which sides of which islands, month by month.
Booked already and flying in season? Check recent guest photos (review sites sort by date; the beach in last week's pictures is the beach you'll get odds-wise), and pack the mindset: winter trips barely need the thought, early-summer trips deserve a resort with barriers or a lee-shore position, and any trip survives a brown week if the pools and the rest of the property carry their weight.
Influxes typically run April through August, tapering through fall — winter is usually the clearest window. Heavy and light years alternate unpredictably, so treat any seasonal note as odds rather than a promise, and check recent conditions close to travel.
Anywhere outside the tropical Atlantic belt: Mexico's Pacific coast (Los Cabos, Puerto Vallarta), the Mediterranean, the Maldives, Mauritius and the wider Indian Ocean, and Southeast Asia. Within the Caribbean, lee shores and north-facing beaches — Jamaica's north coast, Grace Bay in Turks & Caicos, the west coasts of Barbados and Curaçao — are usually far lighter than east-facing sand.
The good ones fight it daily — dawn raking, tractor sweeps, and offshore barriers at the best-positioned properties — and bay-sheltered resorts genuinely fare better than open-coast neighbors. In a heavy influx no one wins completely; that's the week the pool scene earns its keep.
Floating amounts are harmless to swimmers. Large rotting accumulations on shore release hydrogen sulfide — the rotten-egg smell — which is unpleasant and can irritate eyes and airways at close range, so resorts clear landings quickly. The practical problem is aesthetic: brown water at the shorebreak and buried sand.
June through November scares more travelers than it should — and burns the unprepared ones. The real odds by month and map position, the insurance rule, and when the discount is worth it.
Included, expected, or actually forbidden — the tipping answer changes by brand and by country, and getting it wrong costs you either money or goodwill. Here's the whole system.