Sandals Grande St. Lucian beach forecast: weather, water & waves
Gros Islet, St. Lucia · Windward Islands (St. Lucia, SVG, Grenada), St. Lucia · 14.085, -60.962
Updated : very low seaweed, beach grade B-, sea 85°F.
Also listed as Sandals Grande St Lucian Spa and Beach All Inclusive Resort Adults Only.
Veabird's call
Saturday is A- with low seaweed and 8% rain versus 97% rain Friday.
December and February grade B+, with March busy for spring break.
Grades from Veabird's beach forecast; wording by AI (Muse Spark), checked against the forecast. Updated Nov 13, 06:00 UTC.
Tell me when Sandals Grande St. Lucian grades A
One email when the beach grades A, at most once a week per beach. We only ask for your email address, and every email has a one-click unsubscribe.
We email you a link to confirm first. Privacy
Plan your trip
Where to stay nearby
Partner links: Veabird may earn a commission at no cost to you. Partners never affect forecasts or scores.
Questions about Sandals Grande St. Lucian
Does Gros Islet get sargassum (seaweed)?
Yes, in season. At Sandals Grande St. Lucian the typical-year risk is moderate or higher from May to August and peaks in July (high). How much lands varies a lot by year, wind and currents.
What are the worst and best months for seaweed at Sandals Grande St. Lucian?
Worst: July, when heavy seaweed is most likely. Best: September through April, when the risk is usually low.
How warm is the water at Sandals Grande St. Lucian?
About 84°F in November. The sea is warmest in September and October (about 86°F) and coolest in February (about 81°F).
When is the best time to visit Sandals Grande St. Lucian?
For warm water, low seaweed and dry weather, aim for February, March, April and December. April is usually the quietest of those, with about 12 rainy days and a sea near 82°F; seaweed risk is low.
Does Sandals Grande St. Lucian have a sargassum barrier or beach cleanup?
Veabird doesn't track barriers hotel by hotel; this is what the Windward Islands area does. Offshore barriers in Windward Islands: rare. Resort crews: Leeward resorts rarely affected; windward resorts rake daily. Typical clearing time: Resorts same-day.
When is hurricane season at Sandals Grande St. Lucian, 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 Sandals Grande St. Lucian in 22 of the 55 seasons from 1971 to 2025, and a hurricane within 58 miles in 5. The riskiest stretch is around August 20, when the chance of a storm passing in any one week is about 5%; across all of August it is about 17%. Flexible bookings and travel insurance help in the peak weeks.
What guests say about Sandals Grande St Lucian Spa and Beach All Inclusive Resort Adults Only
Guests like Outstanding, personalized butler and staff service · Beautiful, picturesque location · Highly praised dining (Bombay called out) · Excellent entertainment and social activities
- Cleanliness
7.9 - Service
7.9 - Location
7.9 - Room Quality
7.9 - Amenities
7.9 - Value for Money
7.9 - Food and Beverage
7.9 - Overall Experience
7.9
Read all 282 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 Sandals Grande St. Lucian
Sargassum risk at Sandals Grande St. Lucian typically peaks around July (high: moderate or heavier seaweed on the beach in an estimated 45% of weeks). Months most likely to see heavy seaweed: July. Lowest-risk months: January, February, March, April, September, October, November and December. Actual landings vary a lot by year, wind and currents; check the live conditions above.
Estimated share of weeks in each month with moderate or heavier seaweed on the beach. Veabird takes the landing season measured on Martinique's shores (Madininair's hydrogen-sulfide sensors beside stranding sites, 2018–2026) and scales it by how often NOAA AOML satellites see notable seaweed within about 20 km of this stretch of coast: 22% of weeks here on average, against 14% off Martinique, so the full season applies. The satellite share (2016–2024, the top fifth of all coast-weeks, adjusted for this beach's exposure of 20%) 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 290°; 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.
St. Lucia, St. Vincent & Grenada month by month
Typical weather, water temperature, seaweed and crowds for every month: the best time to visit St. Lucia, St. Vincent & Grenada.
- St. Lucia, St. Vincent & Grenada in January
- St. Lucia, St. Vincent & Grenada in February
- St. Lucia, St. Vincent & Grenada in March
- St. Lucia, St. Vincent & Grenada in April
- St. Lucia, St. Vincent & Grenada in May
- St. Lucia, St. Vincent & Grenada in June
- St. Lucia, St. Vincent & Grenada in July
- St. Lucia, St. Vincent & Grenada in August
- St. Lucia, St. Vincent & Grenada in September
- St. Lucia, St. Vincent & Grenada in October
- St. Lucia, St. Vincent & Grenada in November
- St. Lucia, St. Vincent & Grenada in December
Weather, water & seaweed by month at Sandals Grande St. Lucian
Average highs run from about 83°F in January and February to 88°F in September. The sea is warmest in September and October (about 86°F) and coolest in February (about 81°F). February, March and April are usually the driest, with about 12 rainy days each; July is the wettest, with about 20 rainy days. Seaweed risk is usually lowest in December and highest in July.
| Month | Avg high | Sea | Rainy days | Sargassum |
|---|---|---|---|---|
| Jan | 83°F | 82°F | 15 | Very low |
| Feb | 83°F | 81°F | 12 | Low |
| Mar | 84°F | 82°F | 12 | Low |
| Apr | 86°F | 82°F | 12 | Low |
| May | 87°F | 83°F | 13 | Moderate |
| Jun | 87°F | 83°F | 16 | Moderate |
| Jul | 86°F | 84°F | 20 | High |
| Aug | 87°F | 85°F | 19 | Moderate |
| Sep | 88°F | 86°F | 19 | Low |
| Oct | 87°F | 86°F | 19 | Very low |
| Nov | 85°F | 84°F | 17 | Very low |
| Dec | 84°F | 83°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
- Rare
- Public cleanup
- Hotel crews; Atlantic coasts (Dennery, Grenada east, Canouan windward) largely uncleared
- Resort crews
- Leeward resorts rarely affected; windward resorts rake daily
- Typical clearing time
- Resorts same-day
Safety notes
US State Dept: St. Lucia Level 1, St. Vincent & the Grenadines Level 1, Grenada Level 1 (verify)
- Petty crime in Castries/Rodney Bay nightlife; use licensed taxis
- Steep winding roads; night driving not advised
- Grenada/Carriacou south of main hurricane belt but hit by Ivan 2004, Beryl 2024
Check official advisories and local flags before swimming. Decomposing sargassum releases hydrogen sulfide; avoid heavy piles.
Things to do near Gros Islet, St. Lucia
- The Pitons & Sulphur Springs
- Tobago Cays Marine Park
- Grand Anse Beach, Grenada
- Underwater Sculpture Park, Grenada
- Pigeon Island, St. Lucia
- Bequia Admiralty Bay
Fly in for the best beach days
Suggested dates fall in December, typically the lowest-seaweed month ahead for Sandals Grande St. Lucian. Change them to match the live forecast above.
Opens a flight search in a new tab. Partner link: Veabird may earn a commission.
Nearest airports
- George F. L. Charles (Castries) (SLU), ~8 km
- Hewanorra Intl (St. Lucia) (UVF), ~39 km
Nearby resorts
- The Landings Resort & Spa Gros Islet, St. Lucia · 1 km
- Bay Gardens Beach Resort Rodney Bay, St. Lucia · 1 km
- Rodney Bay / Reduit Beach Resorts Rodney Bay, St. Lucia · 2 km
- Harmony Suites Rodney Bay, St. Lucia · 2 km
- Bay Gardens Marina Haven Hotel Rodney Bay, St. Lucia · 2 km
- Royalton Saint Lucia - Autograph Collection Cap Estate, St. Lucia · 2 km
Embed this forecast
Hotels and travel sites can show live conditions for Sandals Grande St. Lucian for free. Get the widget · Data & API