Every day, NOAA's Atlantic Oceanographic and Meteorological Laboratory (AOML) and the University of South Florida publish the Daily Sargassum Inundation Risk (SIR). For each stretch of coast, it looks at satellite measurements of floating algae in the 50–100 km of ocean around it, compares them with recent days, and gives a level: low, warning, medium or high.
This site takes the newest report every morning, keeps Puerto Rico's coast, and groups it by coast and by town. Nothing is edited by hand.
It's an estimate for a stretch of coast, not an inspection of a beach. Clouds can hide sargassum. Sheltered beaches can stay clear on a high day, and an exposed beach can get some on a low day. The NOAA report is usually 1–2 days behind.
Rotting piles of sargassum release hydrogen sulfide. If you have asthma or breathing problems, keep your distance. Official guidance: Department of Health and DRNA. This site doesn't give medical advice.
NOAA takes photo reports to improve the data: use the reporting form on the NOAA SIR page.
Data: NOAA/AOML CoastWatch Caribbean and Gulf of America node and USF (AFAI). Used under NOAA's free-use terms, which come with no warranty. This is an independent site, not affiliated with NOAA, USF, DRNA or any government agency. Open data: latest.json, history.json.
No accounts, no cookies, no ad trackers. We may count visits with cookie-free analytics.