What's the Sea Temperature in September? Kaş Swimming Guide

Packed your swimsuit at the very bottom of your suitcase? Thinking "summer's over, the sea must be cold by now"? In Kaş, things work a little differently. The sun is still high, the sea is still warm, and once the crowds thin out, this place turns into something close to paradise. So what's the sea temperature in September, really — and is swimming still an option, or is that just a marketing line? Let's find out together, and if you'd like to experience it yourself, you can start with a Kaş boat tour.

What's the Sea Temperature in September?

The Mediterranean generously releases the heat it's stored all summer, and September is no exception. Sea water temperature during this period usually hovers around 28-29°C — barely different from July or August. Even as air temperatures start to dip slightly, the sea stays warm well into the evenings. So when people ask "does the sea cool down in September," the answer usually surprises them: the drop is slow and gradual.

Why Does the Sea Stay So Warm in Autumn?

Water doesn't heat up or cool down as quickly as air. All that heat absorbed over the summer gets stored in the deeper layers of the sea, and it's released slowly throughout September and October. This simple physical fact is exactly why Kaş and its surroundings remain such an appealing swimming destination well into autumn.

Kaş's Changing Atmosphere in Autumn

Once the summer crowds ease off, Kaş takes on a different character entirely. Street cafés feel calmer, boats have more room to breathe, and the bays around Kekova can feel almost private. Sunbathing in one of Kekova's turquoise coves while spotting only a couple of other boats nearby instead of a dozen — that's the real privilege of this season. The natural beauty never changes, but the quality of the experience genuinely improves.

When Do Kekova Tours End?

Kekova tours typically run through the end of October. That means you still have a few weeks left to sail over the sunken city, explore the ancient ruins, and drift through those deep blue bays. Water clarity also tends to improve in autumn, so underwater visibility can actually be better than during the peak heat of summer.

💡 Captain Ergun's Tip: In September and October, plan your tour for the early morning rather than the afternoon. The sea is calmer at that hour, and sunlight hits the bays more directly. Having breakfast on board and starting your day early is the best way to make the most of autumn's biggest advantage.

Can You Swim in October and November?

Yes, you can — and for us locals in Kaş, that's nothing unusual. On sunny days, locals routinely swim well into the winter months. In October, sea temperatures generally sit between 24-26°C, and in November, sunny days can still keep the water above 20°C. A calm, sunny November day with light layers on and a quick dip in the sea is a fairly common sight around here.

Which Month Is Best for Swimming?

September strikes the best balance between warmth and quiet. October is a touch cooler but still very swimmable. November requires a bit more selectivity — but catch a sunny, windless day and a refreshing swim is still very much possible.

Frequently Asked Questions

What is the sea temperature in September in Kaş?

In September, sea water temperature around Kaş and Kekova averages 28-29°C, staying remarkably close to summer levels.

Is it still warm enough to swim in Kaş in October?

Yes, absolutely. October sea temperatures typically range between 24-26°C, which remains comfortably swimmable for most visitors.

Until when do Kekova boat tours run?

Kekova tours generally continue through the end of October, though this can extend further in some years depending on weather conditions.

Can you swim in November too?

On sunny, windless days, yes. Locals themselves often swim through the winter months when conditions allow, so November isn't entirely off the table either.

Final Thoughts: Don't Pack the Swimsuit Away Just Yet

Summer in Kaş lasts a lot longer than the calendar suggests. Sea temperatures in September stay close to peak summer levels, and even in October and November, sunny days still make swimming possible. With calmer bays, clearer water, and smaller crowds, autumn might just be the most special season of all in Kekova. If you'd like to experience it for yourself, book a Kaş boat tour and discover this route where history and nature meet, up close.