Miami Beach Seaweed Map — Today's Sargassum, Live
Updated June 29, 2026 from Copernicus satellite data — refreshed 4× per day.
Here's the Miami Beach seaweed map for today: each stretch of the Miami coast carries a live status (clean, moderate, or avoid), a 0-100 Beach Score, and a 7-day outlook, refreshed four times a day. South Beach, mid-Beach and the full Miami sand show their current status today right on the map above — check it the morning you go, because an east wind can land sargassum overnight. What makes this different from a government bulletin: we work at the level of your actual beach, not the region. The map reads Copernicus and NOAA satellite imagery (the same AFAI index NOAA uses), then cross-checks against people reporting from the sand. It's measured, not guessed. When clouds block the satellite, each beach shows its data age and a confidence level instead of pretending — and a published backtest tells you how often we've been right. No averages, no seasonal hand-waving: just where the water is clean on Miami Beach right now.
Which Miami beaches are clean today?
The map sorts the Miami coast beach by beach because conditions split sharply over a few miles. South Beach and the Art Deco stretch share one east-facing exposure, so they tend to move together; mid-Beach and the wider raked sand to the north can read differently the same morning. The Gulf Stream runs close offshore here, which is exactly why Miami sees more sargassum than the central coast — it delivers mats straight to the sand. Tap any beach for its Beach Score and status today. The cleanest option this morning isn't always the most famous one, so don't assume South Beach is your best bet until the map confirms it — let the satellite pick for you.
When does sargassum clear off Miami Beach?
Beached sargassum doesn't vanish on a schedule — it decays once no new material lands, on roughly an exponential curve, while wind and Gulf Stream wobbles can push fresh mats in or pull the coast clean overnight. That's why the 7-day forecast on each Miami beach matters more than any seasonal average. Florida's window runs roughly May through August, peaking in June and July, but the day-to-day reality on Miami Beach swings hard inside that window. The forecast projects each detected offshore mat forward, so you can see whether tomorrow looks clearer than today before you commit. Days 1-3 carry the most confidence; the whole outlook recomputes every morning as new satellite passes arrive.
Is the seaweed on Miami Beach dangerous?
Fresh sargassum in the water is harmless — it's mostly a nuisance for swimming and an eyesore. The real issue comes as it piles up and rots on the sand: decomposing mats release hydrogen sulfide (H2S), the rotten-egg gas that can irritate eyes, throat and lungs, especially for people with asthma or respiratory conditions. A beach flagged avoid on the map usually means thick, decaying accumulation, not a thin line at the waterline. If you smell sulfur or see brown windrows baking in the sun, keep your distance and pick a beach showing a clean status today. The map's status reflects accumulation, so it's a practical proxy for whether the air will be pleasant where you're standing.
Where to go instead when Miami is hit
When the Miami coast reads moderate or avoid across the board, the map makes the alternative obvious. Fort Lauderdale to the north follows a similar Atlantic pattern but can diverge on a given day, so check it before assuming it's the same. For a near-certain escape, the Gulf coast — Clearwater and the west side — almost never sees meaningful sargassum, because the currents rarely deliver it there. It's a longer drive but a reliable clean day. Use the live Florida map to compare every tracked beach at once, then lock in your call the morning of, not the night before. The point is simple: don't waste a beach day guessing when the satellite already knows.
Frequently asked questions
Is there seaweed on Miami Beach today?
Check the live map above — each Miami beach shows its status today (clean, moderate, or avoid) and a 0-100 Beach Score, updated four times a day from Copernicus and NOAA satellite imagery. South Beach and the wider Miami sand can read differently the same morning, so tap your specific beach rather than relying on a single citywide answer.
Is the South Beach seaweed map live?
Yes. South Beach carries its own live status and Beach Score on the map, refreshed four times a day and cross-checked against people reporting from the sand. East-facing South Beach shares the Art Deco stretch's exposure, so they often move together. When clouds block the satellite, the beach shows its data age and confidence level rather than guessing.
How accurate is the Miami sargassum forecast?
We use the same AFAI satellite index NOAA relies on, sourced from Copernicus and NOAA and refreshed four times a day, with a published backtest showing how often we've been right. Floating mats detect reliably in clear weather; clouds can delay readings, so every beach displays its data age and confidence. Days 1-3 of the 7-day forecast carry the most confidence.
When is sargassum worst in Miami?
Miami's sargassum window runs roughly May through August, peaking in June and July, driven by the Gulf Stream running close offshore. Winter is essentially seaweed-free. Within the season, day-to-day conditions swing hard with wind and current — which is why we track Miami Beach with live satellite data four times a day instead of quoting a seasonal average.
Where can I avoid seaweed near Miami?
When the Miami coast is hit, the Gulf coast — Clearwater and Florida's west side — almost never sees meaningful sargassum, making it the most reliable clean-day escape. Fort Lauderdale to the north follows a similar Atlantic pattern but can diverge on a given day. Compare every tracked beach on the live Florida map, then decide the morning you go.
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