Methodology & measured forecast accuracy
Updated August 6, 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 97% of the time (mean AFAI error 0.013), 3-day status 95%. Nobody else in this market publishes their forecast accuracy.
Live Seaweed & Sargassum Map — Cancún and the Riviera Maya · Sargassum Forecast for Cancún & the Riviera Maya — Next 7 Days · Beaches Without Sargassum Today in Cancún & the Riviera Maya · Sargassum Season in Cancún & the Riviera Maya — 2026 Guide · Best beaches without sargassum · Sargassum this week · Methodology & accuracy · For hotels · Press & media · Cancun Seaweed Map 2026 — Live Sargassum, Beach · Cancún Seaweed Today — Live Satellite Sargassum · Tulum Sargassum Today — Live Beach Status by · Live map
Sargassum network: Martinique · Guadeloupe · Punta Cana · Miami & Florida