Decameron Isleño beach forecast: weather, water & waves
San Andrés, CO · San Andrés & Providencia, Colombia · 12.585, -81.698
Updated : very low seaweed, beach grade A-, sea 86°F.
Also listed as Decameron Isleño - All Inclusive.
Veabird's call
Friday is the go: A- with little seaweed, mostly dry weather and 86°F water.
March at A- and April at B+ are best, good months for Seven-color lagoon trips.
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 Decameron Isleño
Does Decameron Isleño 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 Decameron Isleño?
About 85°F in November. The sea is warmest in October (about 86°F) and coolest in February and March (about 82°F).
When is the best time to visit Decameron Isleño?
For warm water and dry weather, aim for January through May. May is usually the quietest of those, with about 17 rainy days and a sea near 84°F.
When is hurricane season at Decameron Isleño, 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 Decameron Isleño in 8 of the 55 seasons from 1971 to 2025, and a hurricane within 58 miles in 3. The riskiest stretch is around October 22, when the chance of a storm passing in any one week is about 1%; across all of October it is about 5%.
What guests say about Decameron Isleño - All Inclusive
Guests like Location is convenient · Food quality is average
Watch for Cleanliness issues · Poor service response time
- Cleanliness
4.9 - Service
8.9 - Location
8.9 - Room Quality
5.9 - Amenities
7.4 - Value for Money
7.4 - Food and Beverage
7.9 - Overall Experience
8.3
Read all 267 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 Decameron Isleño
Sargassum is rare at Decameron Isleño: 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: 2% of weeks here on average, against 54% off Quintana Roo, so 4% of that season. The satellite share (2016–2024, the top fifth of all coast-weeks, adjusted for this beach's exposure of 25%) 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 20°; 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.
San Andrés month by month
Typical weather, water temperature, seaweed and crowds for every month: the best time to visit San Andrés.
Weather, water & seaweed by month at Decameron Isleño
Average highs run from about 81°F in February and March to 84°F in August, September, October and November. The sea is warmest in October (about 86°F) and coolest in February and March (about 82°F). March is usually the driest, with about 7 rainy days; October and November are the wettest, with about 26 rainy days.
| Month | Avg high | Sea | Rainy days | Sargassum |
|---|---|---|---|---|
| Jan | 82°F | 83°F | 17 | Very low |
| Feb | 81°F | 82°F | 12 | Very low |
| Mar | 81°F | 82°F | 7 | Very low |
| Apr | 82°F | 83°F | 9 | Very low |
| May | 83°F | 84°F | 17 | Very low |
| Jun | 83°F | 84°F | 25 | Very low |
| Jul | 83°F | 83°F | 25 | Very low |
| Aug | 84°F | 84°F | 23 | Very low |
| Sep | 84°F | 85°F | 23 | Very low |
| Oct | 84°F | 86°F | 26 | Very low |
| Nov | 84°F | 85°F | 26 | Very low |
| Dec | 83°F | 84°F | 21 | 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
- Coralina (environmental authority) and municipality clean Spratt Bight.
- Resort crews
- Decameron properties rake daily.
- Typical clearing time
- East-shore landings cleared within a day or two.
Safety notes
US State Dept: Colombia, Level 3 (verify; islands generally lower risk)
- Tourist card fee required on arrival
- Providencia still rebuilding after Hurricane Iota (2020)
- Scooter/golf-cart accidents common
Check official advisories and local flags before swimming. Decomposing sargassum releases hydrogen sulfide; avoid heavy piles.
Things to do near San Andrés, CO
- Johnny Cay
- Acuario & Haynes Cay
- Seven-color lagoon (Mar de Siete Colores)
- Crab Cay (Providencia)
- Hoyo Soplador
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
- Gustavo Rojas Pinilla Intl (San Andrés) (ADZ), ~1 km
Nearby resorts
- Decameron Aquarium San Andrés, CO · 3 km
- Decameron Marazul San Andrés, CO · 7 km
- Providencia Beach Lodges Providencia, CO · 92 km
- Yemaya Island Hideaway Little Corn Island, NI · 142 km
- Little Corn Island Beach and Bungalow Little Corn Island, NI · 143 km
- Yemaya Island Hideaway & Spa Little Corn Island, NI · 143 km
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