Is There Sargassum in Miami Today?
Updated June 29, 2026 from Copernicus satellite data — refreshed 4× per day.
Whether there's sargassum in Miami today depends on the specific beach — South Beach, Mid-Beach, Key Biscayne and Sunny Isles can each look completely different on the same morning. Open the live map for your beach to see its status today: clean, moderate, or avoid, with the current Beach Score updated today. Most "Miami sargassum" answers online quote a statewide bulletin or a photo from last week. We don't. The Watcher reads Copernicus and NOAA satellite imagery four times a day, locates the seaweed mats drifting offshore, and reports what's actually reaching each stretch of Miami sand right now — measured, not guessed. When clouds block the satellite, we say so instead of pretending. Below, find which Miami beaches are clearest today, when conditions usually shift, and what the rotting-seaweed smell means for your day. Check the Beach Score before you load the car, not after.
Which Miami beaches are clean today?
Miami is not one beach, and sargassum rarely lands evenly across it. On any given morning South Beach can be carpeted while Key Biscayne stays open, or the reverse — it comes down to wind angle and how the Gulf Stream nudges the mats inshore. That's why we score each beach separately rather than issuing one Miami-wide verdict. Open the live map and look at the status today for the exact beach you have in mind: South Beach, Mid-Beach, Sunny Isles, Haulover, Key Biscayne or Bal Harbour. Each carries its own Beach Score, refreshed four times a day from satellite imagery and corrected by on-the-ground reports when clouds get in the way. If your first choice reads avoid this morning, the map shows you the nearest beach reading clean — so you adjust the plan instead of canceling it.
When will the sargassum clear?
Once a mat beaches, it doesn't vanish on a schedule — it decays gradually, on roughly an exponential curve, unless fresh seaweed lands on top of it. A beach reading avoid today can read moderate in two or three days if no new material arrives, or stay buried if the wind keeps pushing more ashore. That's exactly what the 7-day per-beach forecast is for: instead of guessing, it projects each Miami beach forward day by day, so you can see whether Saturday looks better than today. The nearest days carry the most confidence; the back half of the week is a working estimate that recomputes every morning as new satellite passes come in. Watch the trend line for your beach rather than fixating on one bad morning — Miami conditions can flip fast in either direction.
Is Miami sargassum dangerous? The smell explained
Sargassum itself is harmless to touch, but as it piles up and rots on the sand it releases hydrogen sulfide (H2S) — that rotten-egg smell. In the open air of a breezy Miami beach it's usually just unpleasant, but heavy accumulation in still conditions can irritate eyes, throat and lungs, and people with asthma or respiratory issues should keep their distance from thick, decaying mats. Decomposing piles can also hide marine life and harbor biting sandflies. The practical move is simple: if a beach reads avoid today, the seaweed is thick enough that the smell and irritation are likely real — so use the map to pick a beach reading clean or moderate instead. The Beach Score is built to keep you ahead of exactly this, every morning before you go.
Frequently asked questions
Is there sargassum in Miami today?
It depends on the beach — Miami's coastline varies street by street on the same day. Open the live map and check the status today for your specific beach (South Beach, Key Biscayne, Sunny Isles and others each have their own Beach Score), refreshed four times a day from satellite imagery so you see current conditions, not last week's.
Is there sargassum on South Beach right now?
Check South Beach's live Beach Score on the map for its status today — clean, moderate, or avoid. We update it four times a day from Copernicus and NOAA satellite passes, and correct it with ground reports when clouds block the view, so the reading reflects conditions right now rather than a general Miami bulletin.
Which Miami beach has the least seaweed?
It changes day to day with wind and current, so there's no permanent "cleanest" Miami beach. The live map ranks each beach by its current Beach Score, so you can instantly see which stretch — Key Biscayne, Bal Harbour, Haulover or elsewhere — reads clearest this morning and head there instead of guessing.
How accurate is the Miami sargassum map?
The map runs on Copernicus and NOAA satellite imagery refreshed four times a day, with a published backtest accuracy you can review. The nearest forecast days are the most reliable; later days are estimates that recompute each morning. When clouds block a satellite pass, we flag the lower confidence instead of inventing a number.
When is sargassum season worst in Miami?
Miami's sargassum window runs roughly May through August, typically peaking in June and July, with winter months nearly seaweed-free. But the amount swings hugely year to year with the Atlantic bloom — which is why we track live conditions four times a day rather than relying on seasonal averages to tell you about today.
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Sargassum network: Martinique · Guadeloupe · Punta Cana · Cancún & Riviera Maya