Grand Cayman Marriott Resort beach forecast: weather, water & waves
Seven Mile Beach, KY · Cayman Islands, Cayman Islands · 19.308, -81.385
Updated : very low seaweed, beach grade C+, sea 84°F.
Also listed as Grand Cayman Marriott Beach Resort.
Veabird's call
Saturday grades A- with 3.3 ft waves and 84°F water, the clear go this week.
January with February both grade A-, and seaweed is usually lowest in January.
Grades from Veabird's beach forecast; wording by AI (Muse Spark), checked against the forecast. Updated Nov 13, 01:00 UTC.
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Questions about Grand Cayman Marriott Resort
Does Grand Cayman Marriott Resort get sargassum (seaweed)?
Rarely. Veabird estimates moderate or heavier seaweed on the beach here in fewer than one week in ten in every month. Landings vary by year, wind and currents.
How warm is the water at Grand Cayman Marriott Resort?
About 85°F in November. The sea is warmest in September (about 88°F) and coolest in February (about 81°F).
When is the best time to visit Grand Cayman Marriott Resort?
For warm water and dry weather, aim for January, February, April, August, November and December. August is usually the quietest of those, with about 18 rainy days and a sea near 87°F.
When is hurricane season at Grand Cayman Marriott Resort, and how often do storms hit?
The Atlantic hurricane season runs June through November and peaks around September. A tropical storm passed within 86 miles of Grand Cayman Marriott Resort in 11 of the 55 seasons from 1971 to 2025, and a hurricane within 58 miles in 7. The riskiest stretch is around October 15, when the chance of a storm passing in any one week is about 2%; across all of October it is about 8%. Flexible bookings and travel insurance help in the peak weeks.
What guests say about Grand Cayman Marriott Beach Resort
Guests like Amazing staff · Clean facilities
Watch for Limited beach access · Pool seating situation
- Cleanliness
9.1 - Service
9.6 - Location
9.1 - Room Quality
9.0 - Amenities
8.6 - Value for Money
8.5 - Food and Beverage
9.1 - Overall Experience
9.1
Read all 425 reviews · Compare on Expedia
Scores and reviews come from guests who stayed, through LiteAPI (Nuitée). The likes, watch-fors and category scores are an AI summary of those reviews. Partner links: Veabird may earn a commission.
Sargassum season at Grand Cayman Marriott Resort
Sargassum is rare at Grand Cayman Marriott Resort: Veabird estimates moderate or heavier seaweed on the beach in fewer than one week in ten in every month.
Estimated share of weeks in each month with moderate or heavier seaweed on the beach. Veabird takes the landing season seen on Quintana Roo's beaches (a Puerto Morelos beach camera, 2015–2020, and the Mexican Navy's beach alerts, 2022–2026), the nearest coast with a multi-year beach record (this one has none), and scales it by how often NOAA AOML satellites see notable seaweed within about 20 km of this stretch of coast: 3% of weeks here on average, against 54% off Quintana Roo, so 6% of that season. The satellite share (2016–2024, the top fifth of all coast-weeks, adjusted for this beach's exposure of 15%) measures seaweed offshore, not on the sand: off the Riviera Maya it reads high even in winter, when little lands. Very low under 10%, Low 10–24%, Moderate 25–44%, High 45–69%, Very high 70%+. Beach faces 270°; onshore winds from that direction push seaweed ashore. Satellite sargassum data: USF Optical Oceanography Lab (Sargassum Watch System) via NOAA AOML. The satellite record as open data.
Cayman Islands month by month
Typical weather, water temperature, seaweed and crowds for every month: the best time to visit Cayman Islands.
Weather, water & seaweed by month at Grand Cayman Marriott Resort
Average highs run from about 81°F in February to 89°F in July and August. The sea is warmest in September (about 88°F) and coolest in February (about 81°F). January is usually the driest, with about 13 rainy days; October is the wettest, with about 22 rainy days.
| Month | Avg high | Sea | Rainy days | Sargassum |
|---|---|---|---|---|
| Jan | 82°F | 82°F | 13 | Very low |
| Feb | 81°F | 81°F | 14 | Very low |
| Mar | 83°F | 82°F | 20 | Very low |
| Apr | 84°F | 82°F | 17 | Very low |
| May | 87°F | 84°F | 20 | Very low |
| Jun | 87°F | 85°F | 20 | Very low |
| Jul | 89°F | 86°F | 20 | Very low |
| Aug | 89°F | 87°F | 18 | Very low |
| Sep | 88°F | 88°F | 20 | Very low |
| Oct | 86°F | 87°F | 22 | Very low |
| Nov | 84°F | 85°F | 18 | Very low |
| Dec | 83°F | 83°F | 15 | Very low |
Monthly averages from 6 years of ERA5 reanalysis (Open-Meteo) for this area's 0.5° grid cell; rainy days have at least 1 mm (0.04 in). Sargassum is the typical-year estimate described above. Any given year can differ.
Cleanup & barriers
- Offshore barriers
- None
- Public cleanup
- Department of Environmental Health beach sargassum removal program
- Resort crews
- Seven Mile Beach resorts rake early
- Typical clearing time
- Hours on Seven Mile Beach; East End / North Side slower
Safety notes
US State Dept: Cayman Islands, Level 1 (normal precautions) — verify
- Low crime; watch for petty theft from unattended beach bags and cars
- Strict drug and firearm laws
- Rip currents rare on Seven Mile Beach but possible on exposed east and north coasts
Check official advisories and local flags before swimming. Decomposing sargassum releases hydrogen sulfide; avoid heavy piles.
Things to do near Seven Mile Beach, KY
- Stingray City
- Seven Mile Beach
- Rum Point & Starfish Point
- Kittiwake wreck dive
- Pedro St. James
- Cayman Brac & Little Cayman diving
Fly in for the best beach days
Suggested dates are a week in December. Change them to match the live forecast above.
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Nearest airports
- Owen Roberts Intl (Grand Cayman) (GCM), ~3 km
Nearby resorts
- George Town Villas Seven Mile Beach, KY · 0 km
- Margaritaville Beach Resort Seven Mile Beach, KY · 1 km
- Hampton by Hilton Grand Cayman Seven Mile Beach Seven Mile Beach, KY · 1 km
- Regal Beach Club Seven Mile Beach, KY · 1 km
- Cayman Reef Resort Seven Mile Beach, KY · 1 km
- Cayman Club Seven Mile Beach, KY · 2 km
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