Are there jellyfish in Perdido Key?
Yes, jellyfish appear seasonally at Perdido Key, most commonly in the warmer water of late summer when onshore winds push them toward the beach. When they've been spotted, lifeguards fly a purple flag. Most stings here are painful but minor.
When and what
The usual late-summer culprits are moon jellies (largely harmless), sea nettles, and occasionally the more painful Portuguese man-o'-war, which blows in on the wind. Onshore winds are what bring them ashore, so a stretch of wind out of the south raises the odds.
The purple flag
A purple flag means dangerous marine life — usually jellyfish — has been spotted. It flies alongside the regular surf flag, not instead of it, so a beach can be green-and-purple (calm water, but watch for jellies). We show the current flags on Beach Today.
If you get stung
Rinse the area with vinegar or seawater (not fresh water, which can trigger more stingers), carefully remove any tentacles, and soak in hot water. Seek medical help for a man-o'-war sting, a large reaction, or any trouble breathing.
Reading the beach for jellies
Look at the wrack line before you look at the water. A row of clear blobs or the blue floats of man-o'-war along the high-tide mark means the same thing is in the surf. Beached jellies still sting — keep kids and dogs from poking them. Onshore wind for a day or two is what stacks them up; a north wind clears them out. Rash guards and swim leggings help a lot with the minor stuff, and a small bottle of vinegar in the beach bag is the local move.
When to skip the Gulf
Purple flag plus a wrack line full of blue balloons is a pool day, especially with small kids — a man-o'-war sting is a genuinely bad hour and occasionally worse. Moon jellies on a green day are more nuisance than danger; go in, but glance around before you dive. Check today's flags and the cam before you drive down, and remember the bay and lagoon side often has different water and fewer jellies on the same day.
More questions
What months are jellyfish worst in Perdido Key?
Late summer into early fall — August and September especially — when the water is warmest and onshore winds are common.
Should you pee on a jellyfish sting?
No — it can make it worse. Rinse with vinegar or seawater, remove tentacles, then hot water. Seek medical help for a man-o'-war sting or any breathing trouble.
Reviewed August 2026. Conditions change daily — for live numbers see Beach Today.