Sargassum in the Bahamas: where to swim today, beach by beach

Live answer: today’s situation in the Bahamas is shown beach by beach on the map and in the list above, reassessed every morning from the official bulletins. Green dots (score 0-1) mark the quiet beaches, yellow or orange (2-3) a moderate presence that is still fine for a swim, red or black (4-5) the landings to avoid. In an archipelago this spread out, whole areas usually sit in the green even when an ocean-facing shore is loaded. Bear in mind that the picture can turn in 24 to 48 hours with the wind and the currents, and a beach that is clear this morning can take seaweed tomorrow. So rather than memorising “that beach is good”, the reliable move is to check the day’s score shortly before heading out.

Sargassum is a floating brown seaweed (genus Sargassum) that drifts in huge rafts across the sea surface. The phenomenon has escalated in recent years: pushed by the currents of the tropical Atlantic, these rafts cross the ocean from a wide belt between Africa and Brazil before reaching the shores of the region, the Bahamas included. Out at sea the seaweed is useful, sheltering fish, turtles and crabs. The trouble is mass landings: piled on the sand, it rots within two or three days and releases strong-smelling gases. It is a natural process, but at a scale with no precedent, now closely tracked by scientific bodies and local authorities.

Because the Bahamas are not one shoreline. The archipelago strings some 700 islands and cays across about 1,000 km of ocean, lying across the sargassum flow that rides up towards the Florida Straits. A drifting raft is not a wall: it travels in ribbons and patches, so it can strand on the Atlantic front of Eleuthera in the morning while Volleyball Beach, tucked inside Elizabeth Harbour in the Exumas, stays perfectly clear the same day. An average for “the Bahamas” therefore tells you almost nothing: the same date mixes loaded beaches and spotless ones, sometimes on the same island. Here more than anywhere, the per-beach map is not a luxury, it is the only reading that makes sense.

The ocean-facing fronts that look east and south are first in line. On Eleuthera, the Atlantic side leads: Pink Sands Beach on Harbour Island faces due east, French Leave Beach at Governor’s Harbour opens northeast, and Lighthouse Beach, down in South Eleuthera, faces east as well. In the Abacos, the barrier cays show their ocean side to the flow: Garbanzo Beach on Elbow Cay opens southeast. In the Exumas, the beaches along Exuma Sound sit windward: Coco Plum Beach on Great Exuma (northeast) and Tropic of Cancer Beach on Little Exuma. And on Grand Bahama, the southern shore (Lucaya Beach, Taino Beach near Freeport, Gold Rock Beach) catches the flow when it bears from the southeast.

First served does not mean always covered: these are the beaches to check first on the map, not the beaches to cross off.

The archipelago’s quiet side is made of bank and lagoon beaches, the ones that turn their back on the open ocean. In the Exumas, Volleyball Beach on Stocking Island faces west over Elizabeth Harbour. In the Abacos, Treasure Cay Beach looks over the Sea of Abaco, screened by the barrier cays, and Tahiti Beach, a sand spit at the end of Elbow Cay, opens southwest into the same sheltered water. On Eleuthera, the west coast answers the exposed Atlantic front: Ten Bay Beach, near Double Bay, faces west. And Bimini is the textbook case: Radio Beach at Alice Town and Shell Beach on South Bimini line the western shore, facing the Gulf Stream and in the lee of the easterly flow, the archipelago’s structural refuge.

Structural does not mean guaranteed: an unusual spell of wind can carry seaweed where it is not expected, and the day’s score always has the last word.

The capital sits in between. The beaches of New Providence and Paradise Island line the northern front: Cable Beach faces northwest, Goodman’s Bay Beach, Junkanoo Beach and Love Beach face north, like Cabbage Beach on Paradise Island. That puts them at an angle to the easterly flow, so the exposure is moderate: arrivals happen, but far less than on an open Atlantic front.

Management helps too: on New Providence, the Public Parks and Public Beaches Authority runs beach cleanup operations, Goodman’s Bay among the sites, and the collected seaweed is sent for recycling. On a normal day the capital’s beaches are a safe bet, and the map confirms it each morning.

The season mainly runs from spring to autumn, often peaking between April and August, but it varies a lot from one year to the next. Some years bring almost nothing, others break records. A landing lasts from a few days to several weeks, with no guaranteed end date: everything depends on the rafts drifting in from the tropical Atlantic, on the currents and on the wind direction. In practice there are calm windows in the middle of the season, and an arrival remains possible outside it. That is why a daily update, beach by beach, is worth far more than a seasonal average when you are deciding where to swim.

In the great majority of cases, no: a beach with light or moderate sargassum poses no risk for swimming in the Bahamas. The risk comes with heavy, prolonged landings. As it decomposes, the seaweed releases hydrogen sulphide (H₂S) and ammonia, which smell of rotten eggs. In high concentrations these gases can bother sensitive people, such as asthmatics, babies and pregnant women, and they tarnish jewellery and electronics. Authorities close the worst affected spots (black score). For a visitor the rule is simple: as long as the smell stays faint and the score is below red, the beach is fine to use. That is exactly what the odour index shown on each beach summarises.

Partly, yes. The forecast rests first on satellite monitoring of the offshore rafts: the analysis of satellite imagery picks them up tens of kilometres out, which opens a window of a few days depending on the currents and the trade winds across the banks. Over a longer horizon, monthly bulletins (NOAA, University of South Florida) estimate how much seaweed is sitting in the Atlantic, and therefore the risk over the coming weeks. FanGass combines those satellite outlooks with the official weather bulletins to anticipate, beach by beach, where a landing is likely. Since no forecast is fully reliable, as a change of wind can rewrite everything overnight, the daily update is what really makes the difference.

Every monitored beach in the Bahamas gets a score from 0 to 5 and a colour. Green (0-1): quiet, go ahead. Yellow (2): a little sargassum, swimming is fine. Orange (3): a moderate, visible amount, but you can still swim; plenty of people do, and you decide based on the smell that day. Red (4): heavy landing, strong smell, better to avoid. Black (5): evacuated zone. The rule worth remembering: only red and black are genuinely to be avoided, and below that swimming remains possible. An odour index (none / faint / strong) completes the score, because it is often the smell of decomposition, more than the seaweed itself, that ruins the outing.

No. An archipelago is probably the best-placed kind of destination for living with sargassum, because almost every island offers a sheltered flank on the very same day. Loaded Atlantic front on Eleuthera? Ten Bay Beach faces the other way. Seaweed at Garbanzo Beach? Tahiti Beach and Treasure Cay Beach sit on the protected Sea of Abaco. Arrivals along Exuma Sound? Volleyball Beach hides inside Elizabeth Harbour. And the west coast of Bimini (Radio Beach, Shell Beach) is calm on most days, as are the beaches of Nassau on a normal morning. Rather than cancelling, keep a little flexibility in your plans and check the day’s score, beach by beach, before choosing where to lay your towel.

Every morning, FanGass gathers the official monitoring bulletins (the Department of Environmental Planning and Protection, the Public Parks and Public Beaches Authority, NOAA AOML, the University of South Florida monthly outlook and the local press: Nassau Guardian, Tribune242, Eyewitness News), cross-checks them against satellite imagery of the offshore rafts, and boils it down to a score from 0 to 5 per beach in the Bahamas. User reports from the ground adjust the scores live when several agree, and everything is reassessed each day. The service is free, edited by the Katchak agency.