The Gulf of Mexico may be known to have its fair share of powerful jellyfish, but that doesn't have to ruin your vacation. To be prepared for your trip to one of the many top Galveston beaches, here are the types of jellyfish found in the area and what you should do if you are stung.

Yes, jellyfish are a regular and natural part of the marine ecosystem in Galveston, Texas, and sightings are common throughout the year. The most frequent species encountered by beachgoers are the Moon Jellyfish (which have a mild, often unnoticeable sting) and the more painful Cabbagehead (Cannonball) Jellyfish. However, the most significant concern for swimmers is the Portuguese Man o' War, which is technically a siphonophore rather than a true jellyfish. Identifiable by its bright blue-violet air bladder that floats on the surface, its long, trailing tentacles can deliver a powerful and agonizing sting even after the creature has washed up dead on the shore. In 2026, jellyfish activity in Galveston often peaks during the late summer and early fall when warm Gulf currents and winds push large "smacks" of them toward the coast. Local beach patrols use a purple flag system to warn visitors when stinging marine life is particularly prevalent, and officials recommend that anyone stung should rinse the area with vinegar or saline solution rather than the infamous "folk remedy" of using urine, which can actually worsen the sting.