Methodology & measured forecast accuracy

Updated June 12, 2026 from Copernicus satellite data — refreshed 4× per day.

We sample the AFAI (floating algae) index from Copernicus/NOAA satellites 4 times a day, pixel by pixel in front of each beach — not a regional average. A weighted daily correction and a beach memory (multi-day half-life) turn the satellite signal into the status you see on the map. The 7-day forecast combines persistence, wind and offshore sargassum-bank detection.

Our data is never hand-edited, never filtered for resorts, never deleted. Sources: Copernicus Marine, NOAA ERDDAP (AFAI), Open-Meteo.

Measured accuracy across our Caribbean network (published backtests): next-day status is correct 78% of the time (mean AFAI error 0.042), 3-day status 78%. Nobody else in this market publishes their forecast accuracy.

Live Sargassum Map of Punta Cana · Punta Cana Sargassum Forecast — Next 7 Days, Beach by Beach · Punta Cana Beaches Without Sargassum Today · Sargassum Season in Punta Cana — 2026 Month-by-Month · Live map

Sargassum network: Martinique · Guadeloupe · Cancún & Riviera Maya · Miami & Florida