Colorful fishing boats docked in a Greek island harbor at sunset, with calm Aegean waters reflecting the pink and orange sky — a serene September evening in Greece — Greece at Sunset in September with Less People

When summer crowds thin but the Aegean and Ionian seas remain warm, September becomes one of the most magical months for a Greek island escape. The weather is still golden, the water temperature perfect for long swims, and the beaches noticeably quieter. If you’re dreaming of dipping into turquoise coves or floating in calm, sun-dappled bays, these are the best Greek islands for swimming in September.

🌊 Why September Is Ideal for Swimming in Greece

Man climbing a ladder from the Aegean Sea onto a wooden dock in Greece, with clear turquoise water and a sunhat resting nearby — perfect scene of September swimming. — Swimming in Greece

Warm waters: The sea retains summer’s heat, averaging 24–26°C (75–79°F).
Fewer tourists: Families and peak-season travelers have gone home, leaving beaches more serene.
Calmer atmosphere: Local life slows down, and tavernas feel more authentic and welcoming.

🏝️ Top Greek Islands for September Swimming

1. Milos – Hidden Coves and Natural Pools

Aerial view of Sarakiniko Beach in Milos, Greece, with striking white volcanic rock formations and turquoise waters — one of the island’s best swimming spots in September — Sarakiniko Beach, Milos Greece

Milos is famous for its unique volcanic coastline and crystal-clear swimming spots. September makes Sarakiniko and Firiplaka beaches feel even more otherworldly, with fewer crowds and perfect water clarity.

2. Naxos – Long Sandy Shores

Aerial view of Agios Prokopios Beach in Naxos, Greece, showing shallow turquoise waters, golden sand, and rocky coves — one of the best family-friendly swimming spots in September — Agios Prokopios Beach, Naxos, Greece

The largest Cycladic island offers wide, shallow beaches like Agios Prokopios and Plaka, where the sea stays warm and calm well into autumn. Great for families and leisurely swims.

3. Rhodes – Sheltered Bays and History

Panoramic view of Tsambika Beach in Rhodes, Greece, with rows of sun loungers, calm turquoise waters, and boats anchored in the sheltered bay — a top swimming spot in September — Tsambika Beach, Rhodes, Greece

On Rhodes, beaches such as Anthony Quinn Bay and Tsambika are ideal for swimming in September. Protected coves keep the water calm, while nearby tavernas offer relaxed post-swim meals.

4. Crete – Endless Variety

Aerial view of Elafonissi Beach in Crete, Greece, with soft pink sand blending into shallow turquoise lagoons — one of the island’s most beautiful swimming spots in September — Elafonissi Beach, Crete Greece

Crete’s southern coast remains hot in September, and beaches like Elafonissi, Falassarna, and Vai are superb for swimming. The island’s size means you’ll always find a cove sheltered from the wind.

5. Paros – Calm Waters and Island Hopping

Peaceful beach in Paros, Greece, with calm turquoise waters and a rocky hillside backdrop — an ideal swimming spot for September island hopping. — Beach on Paros Island Greece

Golden Beach and Kolymbithres are perfect for relaxed dips in September. Bonus: Paros makes an easy jumping-off point for nearby Antiparos if you want to extend your island-hopping adventure.

6. Kos – Gentle Waves and Spacious Beaches

Peaceful sandy beach in Kos, Greece, with gentle turquoise waves and a few swimmers enjoying the warm Aegean Sea — an inviting September swimming spot — Kos Island Beach

Kos’s Aegean beaches, including Tigaki and Paradise Beach, remain warm and inviting. With lighter tourist traffic, you’ll find plenty of space to stretch out after a swim.

✨ Insider Tip

Bring a light jacket for evenings, but keep your swimsuit at the top of your packing list. September in Greece is about long swims, quiet beaches, and sunsets that feel private.

📥 Want to know which island best fits your personality?
Take Our Free Quiz to Find Out

The Best Greek Islands for Swimming in September