Grand Cayman Sargassum Forecast
The current offshore sargassum risk near the Cayman Islands is Very High (as of Aug 2, 2026), from NOAA's daily Sargassum Inundation Risk product. This is an early-warning outlook for floating seaweed offshore, not a live beach report. West-facing Seven Mile Beach is usually spared; the south and east coasts beach first.
Sargassum Outlook for the Cayman Islands
The current offshore sargassum risk near the Cayman Islands is Very High (as of Aug 2, 2026), based on NOAA's Sargassum Inundation Risk product, which is updated daily. This measures floating seaweed within roughly 50 km of the coast. It is an early-warning outlook, not a live beach report.
Is There Sargassum in Grand Cayman Right Now?
Whether seaweed actually strands on a given beach depends on wind and current, not just how much is offshore. Grand Cayman's west coast, including Seven Mile Beach, faces the leeward side and is usually spared unless an unusual weather system pushes westerly winds toward the island. The windward south and east coasts (such as East End and Bodden Town) are the first to see beaching. So a high offshore risk does not mean Seven Mile Beach is covered.
Sargassum season in the Cayman Islands runs roughly April–October, with the heaviest beaching typically in the peak months of May–August. The islands are currently in the peak window.
The offshore risk has held steady versus last week and has been at an elevated level for about 86 weeks. Daily.ky also surfaces a one-to-two-week supply indicator from NOAA ERDDAP to flag changes before they reach shore.
For the live zone-by-zone outlook and the latest update, see the sargassum tracker on this page.
Frequently Asked Questions: Cayman Islands
Is there sargassum in Grand Cayman right now?
Daily.ky publishes a daily offshore sargassum risk outlook for the Cayman Islands from NOAA's Sargassum Inundation Risk product, which tracks floating seaweed within about 50 km of the coast. A high offshore reading does not mean every beach is affected: where seaweed actually strands depends on wind and current. The west coast, including Seven Mile Beach, is usually spared, while the south and east coasts beach first. Check the current reading on /sargassum.
When is sargassum season in the Cayman Islands?
Sargassum season runs roughly April through October, with the heaviest beaching typically in the peak months of May to August. Outside that window the islands usually see little to no seaweed. The amount varies year to year with open-ocean blooms; 2026 has been forecast as a heavy year across the Caribbean.
Does sargassum affect Seven Mile Beach?
Usually not. Seven Mile Beach sits on Grand Cayman's leeward (western) side, so prevailing easterly winds push floating sargassum toward the south and east coasts instead. Seven Mile Beach only sees accumulations in the unusual event that a weather system brings sustained westerly winds. That is why Seven Mile Beach can stay clear even when the offshore risk is high.
Which Grand Cayman beaches get the most seaweed?
The windward south and east coasts get the most: areas around East End, Bodden Town, and the south shore tend to beach first and heaviest during season. The west coast (Seven Mile Beach, West Bay) and sheltered spots get the least. Conditions shift with the wind, so a beach can be clear one day and have weed the next.
How accurate is the Cayman sargassum forecast?
Daily.ky's outlook is an early-warning indicator, not a guaranteed beach report. It is built from NOAA's Sargassum Inundation Risk product (offshore biomass within ~50 km) plus a one-to-two-week supply signal from NOAA ERDDAP. It tells you how much seaweed is in the area and trending toward shore, but exactly where and when it lands still depends on local wind and current on the day.
Where can I check the sargassum forecast for Grand Cayman?
Daily.ky publishes a daily Cayman Islands sargassum outlook at /sargassum, drawn from NOAA's Sargassum Inundation Risk product and updated every day. It shows the current offshore risk level, seasonal context, and a one-to-two-week supply indicator. For a specific beach on a specific day, also check recent local photos or ask your hotel, since conditions change quickly.