Sargassum Tracker

USF OOL Long Term Outlook

Jul 31, 2025
Read PDF

In July 2025, the spatial distribution patterns remained stable from June 2025. Significant Sargassum inundation events have continuously been reported around most Caribbean nations and islands.

Looking ahead: Historically, the amount of Sargassum has mostly decreased from July to August. However, with the continuous transport from the tropical Atlantic to the Caribbean Sea, the amount of Sargassum may remain stable or decrease only slightly, resulting in continuous beaching events around the Caribbean. However, whether a beach or small region receives a large amount of Sargassum depends on local factors that are difficult to predict, including winds and ocean currents. All previous monthly bulletins, as well as daily imagery, can be found under the Sargassum Watch System (SaWS).

SARGASSUM ABUNDANCE INTENSITY

Details

Since 2011, large amounts of Sargassum seaweed have appeared in the Caribbean Sea every summer except 2013, creating many environmental, ecological, and economic problems in many regions. The seaweed originated from the tropical Atlantic and is believed to be a result of climate variability and other natural and unnatural processes. Based on satellite observations and statistics of historical events, in early February 2018, the Optical Oceanography Lab developed the first 1-page Sargassum outlook bulletin for the Caribbean Sea. Since then, the bulletins have been generated and distributed to subscribers by the last day of the month. These monthly bulletins are also made available at the bottom of the SaWS page.

Other Tools

Disclaimer

The information bulletin is meant to provide a general outlook of current bloom condition and future bloom probability for the Caribbean Sea. By no means should it be used for commercial purpose, or used for predicting bloom conditions for a specific location or beach. The authors of this bulletin, as well as Caricoos, USF and NASA, take no responsibility for improper use or interpretation of the bulletin. Any use of the image, data, or graph from this bulletin page in reports or publications should obtain permission from the USF OOL group.