Sand Castle on the Beach forecast: weather, water & waves
Frederiksted, St. Croix, VI · U.S. Virgin Islands, U.S. Virgin Islands · 17.702, -64.885
Updated : very low seaweed, beach grade B+, sea 85°F.
Also listed as Sand Castle on the Beach - Adults Only.
Veabird's call
Sunday is the day at A-, with little seaweed, mostly dry weather and 85°F water.
December and January grade A-, and the Trunk Bay underwater trail is nearby.
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 Sand Castle on the Beach
Does Sand Castle on the Beach 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 Sand Castle on the Beach?
About 85°F in November. The sea is warmest in September and October (about 86°F) and coolest in February and March (about 81°F).
When is the best time to visit Sand Castle on the Beach?
For warm water and dry weather, aim for January, February, March, June and December. June is usually the quietest of those, with about 15 rainy days and a sea near 84°F.
When is hurricane season at Sand Castle on the Beach, 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 Sand Castle on the Beach in 21 of the 55 seasons from 1971 to 2025, and a hurricane within 58 miles in 8. The riskiest stretch is around August 27, when the chance of a storm passing in any one week is about 5%; across all of August it is about 15%. Flexible bookings and travel insurance help in the peak weeks.
What guests say about Sand Castle on the Beach - Adults Only
Guests like Friendly staff · Beautiful location
Watch for Need for more variety in food options · Room size smaller than expected
- Cleanliness
9.4 - Service
9.9 - Location
9.9 - Room Quality
8.8 - Amenities
9.4 - Value for Money
8.8 - Food and Beverage
8.4 - Overall Experience
9.9
Read all 240 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 Sand Castle on the Beach
Sargassum is rare at Sand Castle on the Beach: 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 5% of that season. The satellite share (2016–2024, the top fifth of all coast-weeks, adjusted for this beach's exposure of 14%) 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 305°; 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.
The US Virgin Islands month by month
Typical weather, water temperature, seaweed and crowds for every month: the best time to visit the US Virgin Islands.
- The US Virgin Islands in January
- The US Virgin Islands in February
- The US Virgin Islands in March
- The US Virgin Islands in April
- The US Virgin Islands in May
- The US Virgin Islands in June
- The US Virgin Islands in July
- The US Virgin Islands in August
- The US Virgin Islands in September
- The US Virgin Islands in October
- The US Virgin Islands in November
- The US Virgin Islands in December
Weather, water & seaweed by month at Sand Castle on the Beach
Average highs run from about 81°F in January and February to 86°F in August, September and October. The sea is warmest in September and October (about 86°F) and coolest in February and March (about 81°F). January and December are usually the driest, with about 12 rainy days each; May and October are the wettest, with about 19 rainy days.
| Month | Avg high | Sea | Rainy days | Sargassum |
|---|---|---|---|---|
| Jan | 81°F | 82°F | 12 | Very low |
| Feb | 81°F | 81°F | 13 | Very low |
| Mar | 82°F | 81°F | 13 | Very low |
| Apr | 82°F | 82°F | 17 | Very low |
| May | 84°F | 83°F | 19 | Very low |
| Jun | 85°F | 84°F | 15 | Very low |
| Jul | 85°F | 84°F | 18 | Very low |
| Aug | 86°F | 85°F | 17 | Very low |
| Sep | 86°F | 86°F | 18 | Very low |
| Oct | 86°F | 86°F | 19 | Very low |
| Nov | 84°F | 85°F | 17 | Very low |
| Dec | 82°F | 82°F | 12 | 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 Frederiksted, St. Croix, 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 December. Change them to match the live forecast above.
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Nearest airports
- Henry E. Rohlsen (St. Croix) (STX), ~9 km
Nearby resorts
- Frederiksted Beach Resorts Frederiksted, St. Croix, VI · 3 km
- Renaissance St. Croix Carambola Beach Resort & Spa Frederiksted, St. Croix, VI · 9 km
- The Hotel on the Cay Christiansted, St. Croix, VI · 20 km
- The Buccaneer Christiansted, St. Croix, VI · 23 km
- Divi Carina Bay Beach Resort Grapetree, St. Croix, VI · 28 km
- Bolongo Bay Beach Resort Bolongo Bay, St. Thomas, VI · 67 km
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