Is the sea warm enough for comfortable swimming in Mallorca during September?

Early autumn is a great time for swimming around here, as the sea retains the warmth it’s built up all summer. By September, the water temperatures near popular spots like Es Trenc, Cala Mondrago, and the beaches around Alcudia generally hover comfortably in the mid-20s Celsius, making a seaside dip refreshingly pleasant rather than bracing. The crowds begin thinning as well, which means you can enjoy quieter coves like Cala Llombards or the stretch of sand by Formentor without jostling for space.

Temperatures tend to stay warm enough well into the month, especially along the south and east coasts, though early mornings and late evenings might feel cooler. If you are exploring the Tramuntana coastline or the northern beaches near Pollenca and Port de Soller, the water might be slightly cooler but still very swimmable for most. Keep an eye on local weather updates and sea conditions if you plan on snorkeling or spending long hours in the water.

Whether you’re venturing out from Palma, taking the vintage Soller train, or hopping from village to beach by the TIB bus network, September’s sea temperature usually lets you enjoy a full day by the water followed by a relaxed evening meal of tumbet or fresh seafood. A swim at sunset may even be enhanced by the cooling breeze rolling down from the Serra de Tramuntana, adding a hint of crispness without spoiling the warmth of the day.