Grande Bay Resort beach forecast: weather, water & waves
Great Cruz Bay, St. John, VI · U.S. Virgin Islands, U.S. Virgin Islands · 18.330, -64.797
Seaweed, water and beach grades update every 6 hours; live conditions load below.
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Questions about Grande Bay Resort
Does Grande Bay 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 Grande Bay Resort?
About 86°F in October. The sea is warmest in September and October (about 86°F) and coolest in February and March (about 80°F).
When is the best time to visit Grande Bay Resort?
For warm water and dry weather, aim for January through June. June is usually the quietest of those, with about 11 rainy days and a sea near 84°F.
When is hurricane season in U.S. Virgin Islands?
The Atlantic hurricane season runs June through November and peaks around September. Veabird rates the storm risk in U.S. Virgin Islands as moderate compared with the other beaches it covers; flexible bookings and travel insurance help in the peak months.
What guests say about Grande Bay Resort
Read all 50 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.
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Where to stay nearby
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Sargassum season at Grande Bay Resort
Sargassum is rare at Grande Bay 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: 4% of weeks here on average, against 54% off Quintana Roo, so 7% of that season. The satellite share (2016–2024, the top fifth of all coast-weeks, adjusted for this beach's exposure of 5%) 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 354°; onshore winds from that direction push seaweed ashore. The satellite record as open data.
Weather, water & seaweed by month at Grande Bay Resort
Average highs run from about 79°F in January, February, March and April to 84°F in August, September and October. The sea is warmest in September and October (about 86°F) and coolest in February and March (about 80°F). March is usually the driest, with about 10 rainy days; October is the wettest, with about 17 rainy days.
| Month | Avg high | Sea | Rainy days | Sargassum |
|---|---|---|---|---|
| Jan | 79°F | 81°F | 11 | Very low |
| Feb | 79°F | 80°F | 12 | Very low |
| Mar | 79°F | 80°F | 10 | Very low |
| Apr | 79°F | 81°F | 12 | Very low |
| May | 82°F | 83°F | 12 | Very low |
| Jun | 83°F | 84°F | 11 | Very low |
| Jul | 83°F | 84°F | 14 | Very low |
| Aug | 84°F | 85°F | 15 | Very low |
| Sep | 84°F | 86°F | 15 | Very low |
| Oct | 84°F | 86°F | 17 | Very low |
| Nov | 82°F | 84°F | 16 | Very low |
| Dec | 81°F | 82°F | 13 | 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
- No offshore barriers; occasional booms at a few resorts
- Public cleanup
- Territorial DPNR / hotel crews rake affected beaches; east-end St. Croix and St. Thomas bays hit hardest
- Resort crews
- Large resorts clear frontage daily in season
- Typical clearing time
- Same-day at resorts; public beaches can lag days
Safety notes
US territory - no State Dept advisory (verify local guidance)
- Petty theft and car break-ins; avoid isolated areas at night in Charlotte Amalie and Christiansted
- Drive on the left; steep, narrow roads
- 2017 Irma/Maria showed high hurricane exposure Aug-Oct
Check official advisories and local flags before swimming. Decomposing sargassum releases hydrogen sulfide; avoid heavy piles.
Things to do near Great Cruz Bay, St. John, VI
- Trunk Bay underwater trail (St. John)
- Virgin Islands National Park hikes
- Magens Bay
- Buck Island Reef National Monument
- Christiansted historic district
- Day sail to the BVI
Fly in for the best beach days
Suggested dates are a week in November. Change them to match the live forecast above.
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Nearest airports
- Cyril E. King (St. Thomas) (STT), ~19 km
Nearby resorts
- Gallows Point Resort Great Cruz Bay, St. John, VI · 0 km
- Mango Mojo Villa Great Cruz Bay, St. John, VI · 0 km
- The Westin St. John Resort Great Cruz Bay, St. John, VI · 1 km
- Caneel Bay / North Shore St. John Beaches Cruz Bay, St. John, VI · 2 km
- Elysian Beach Resort Great Bay, St. Thomas, VI · 5 km
- The Ritz-Carlton, St. Thomas Great Bay, St. Thomas, VI · 5 km
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