Whether Mallorca is "swimmable" in April depends entirely on your tolerance for cold water, as the Mediterranean Sea is still quite chilly during the early spring. In 2026, the average sea temperature in April typically hovers around 15°C to 16°C (59°F to 61°F). For most casual vacationers, this is far too cold for a comfortable swim without a wetsuit. However, the air temperature starts to feel like early summer, reaching daytime highs of 20°C to 22°C (68°F to 72°F), which makes sunbathing on the sand very popular. You will often see "courageous" locals or tourists taking a quick dip, but it is generally considered the start of the "sunbathing season" rather than the "swimming season." If swimming is a priority for your April trip, it is best to book a hotel with a heated pool or visit a spa. The island is beautiful in April for hiking and cycling, but the water doesn't typically reach comfortable "swimming" levels (above 21°C) until late June or July.