Generally, it is very safe to swim in the Mediterranean waters surrounding Majorca in 2026, but there are three main factors to watch for: jellyfish, currents, and flags. Most popular beaches use a flag system: Green means safe, Yellow means caution, and Red means "No Swimming" due to dangerous swells or jellyfish blooms. During late summer, "Mauve Stinger" jellyfish can occasionally drift near the shore; while their stings are painful, they are rarely dangerous. Majorca’s local government also monitors water quality daily, and beaches like Playa de Muro and Cala Millor consistently hold "Blue Flag" status for cleanliness. In 2026, some coves may experience "Posidonia" (sea grass) buildup, which is harmless but can make the water look murky. To stay safe, always swim at patrolled beaches with lifeguards, avoid rocky areas where sea urchins are common, and check the "iMar" app for real-time updates on sea conditions and jellyfish sightings before you head out.