sargassum conditions Grassy key Marathon

Question

Our family is vacationing in Marathon next month (mid June), how is the sargassum this time of year? I read to expect a bad year? I will be traveling with my sister who has lung cancer, hoping this won't ruin our trip. We will be staying gulf side on Grassy Key.

Answer

Sargassum seaweed is a seasonal issue in the Florida Keys, typically peaking in late spring through summer. Mid-June is often within the window where sargassum can be more noticeable, particularly along Gulf-facing beaches like those on Grassy Key.

Conditions vary from year to year. Some years see minimal accumulation, while other years have heavier mats that can wash ashore, creating strong odors and impacting swimming and beach activities. Forecasts in recent years have suggested higher-than-average sargassum in parts of the Florida Keys, so it’s reasonable to prepare for some presence.

For families with health concerns, especially respiratory issues like lung cancer, the odor from decaying sargassum could be uncomfortable. Exposure is generally not considered highly dangerous, but it can irritate sensitive lungs or exacerbate breathing issues.

Consider staying at accommodations that provide access to private or maintained beaches, as these are often raked and cleared more frequently than public beaches.
Check local beach reports before arrival; some hotels and resorts update guests daily on beach conditions.
If possible, plan to swim on the Atlantic (ocean) side or in resort pools, which are less affected by sargassum accumulation.

In addition to planning for beach conditions, you can mitigate potential discomfort:

Bring masks or face coverings if sensitive to the smell.
Consider flexible dining and activity plans, prioritizing indoor or waterfront restaurants with easy access from your room.
Consult your sister’s physician regarding any precautions for outdoor exposure, especially in high heat or near decaying seaweed.

Overall, while sargassum may be present, careful planning around beach choice and activities can ensure your trip remains enjoyable. Pools, ocean-facing resorts with regular beach maintenance, and mid-day excursions away from shorelines can help minimize impact.