The water temperature in Palma de Mallorca varies significantly with the seasons, reaching its most "swimmable" state between June and October. In the peak of summer (July and August), the Mediterranean waters are wonderfully warm, averaging between 25°C and 28°C (77°F–82°F), making them ideal for long swims and water sports. By September and early October, the water remains pleasant, usually around 22°C to 24°C, as the sea retains the summer heat longer than the air. However, during the winter and early spring (January to April), the water is quite brisk, dropping to a low of 14°C to 16°C (57°F–61°F). While you can technically swim year-round, most visitors find the water "chilly" before June. For 2026 travelers, the best "warm water" experience without the extreme August crowds is found in late June or early September, when the sea is inviting and the air temperature is comfortably in the high 20s.