Is there seaweed (sargassum) on Perdido Key beaches?
Perdido Key gets seaweed seasonally — mostly sargassum, a brown floating algae that washes ashore in patches during the warmer months when onshore winds push it in. It comes and goes day to day and beach to beach, so a weedy morning is often clear again within a day or two once the wind shifts.
What sargassum is
Sargassum is a natural brown seaweed that floats in the open Gulf and gets blown to shore in mats. It's harmless — in fact it's important habitat for baby fish and sea turtles — but it can pile up on the sand and isn't what people picture for a beach day. It's driven by wind and currents, so it's unpredictable and very localized.
Seaweed vs. red tide
Don't confuse a line of brown seaweed with red tide — they're unrelated. Seaweed is just algae on the sand; red tide is a microscopic bloom that can cause respiratory irritation and fish kills. We track red-tide status on Beach Today.
Reviewed June 2026. Conditions change daily — for live numbers see Beach Today.