Is it too cold to swim in Greece in September?

September is the best month as the seawater has been warming up for some months under a blistering sun. I've often swum in the sea in Greece in early Sept. Remember the later in Sept, the more chance of the weather turning, so the earlier the better. Water temp can also vary according to where you are in Greece.



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GREECE. Greece is home to some of the best swimming waters in all of Europe, and September is a great month to visit, with the weather and sea temperatures as perfect as can be (26.8°C/80.2°F).

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In the Greek islands, the sun will almost certainly be shining all day and the sea will be deliciously warm for swimming. In the southern islands, you can expect daily highs reaching 28ºC, falling to 24ºC towards the end of October.

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Which islands will be hottest?
  • Kos. Average temperature in September: 28ºC. ...
  • Crete. Average temperature in September: 27ºC. ...
  • Cyprus. Average temperature in September: 31ºC. ...
  • Corfu. Average temperature in September: 27ºC. ...
  • Samos. Average temperature in September: 29ºC. ...
  • Santorini. Average temperature in September: 25ºC. ...
  • Halkidiki.


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Santorini beaches and water activities are warm and inviting from May to mid-October and at their best from June to September. Santorini in January (10% Crowded): Damp, cold, and windy (by Santorini standards).

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Santorini in September (85% Crowded): Hot and sunny but cooling a little from August. The weather is similar to June but the water temperature is warmer as it heats over the summer months. Winds have died down. September is the best month to visit Santorini.

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The Greek islands are wonderful from late April to early November. For swimming, sun, and beach activities it's warmest from late May to early October.

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September is often the warmest month of the year. It will be amazing. Make sure your resort has air conditioning as a few of the older ones do not. If you are ocean front you wont need it with the breeze.

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The weather in Greece in September is hot and sunny skies can be found in all Aegean and Ionian islands, with the temperatures boasting an average high of a balmy 82 degrees Fahrenheit and an average snowfall of zero. Despite the sun shining down relentlessly, showers are never too far away.

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Warmest sea temperatures in September The hottest temperatures are found in the eastern and southernmost parts of the Mediterranean – Cyprus averages 27°C and Malta 26°C.

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Greece is home to some of the best swimming waters in all of Europe, and September is a great month to visit, with the weather and sea temperatures as perfect as can be (26.8°C/80.2°F).

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The sea temperature is still warm in October and most days are sunny. Most businesses are open, despite the fewer crowds and, sure enough, you can find great deals in this off-season. The best time to visit Mykonos is October when the crowds have diminished, the water remains warm and rates fall.

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The Greek islands are wonderful from late April to early November. For swimming, sun, and beach activities it's warmest from late May to early October.

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The evenings can be cool with an ocean breeze, dipping down below 20C, so I highly recommend bringing some long pants and a sweater or jacket.

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Best Time for Good Weather in Mykonos: The warmest weather in Mykonos (and all the Greek islands) is between June and September when it's sunny, hot, and the water is perfect for swimming. Water temperature heats throughout the summer months and is warmest in August and early September.

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More of the same glorious summer weather continues throughout September, although the odd day of rain is not unheard of. The balmy climate, somewhat decreased visitor numbers, and abundance of festivals make this month an excellent choice for a visit.

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Both countries are very hot during summer, but Greece is some degrees hotter than Spain. The difference between the Spanish and Greek summer weather is that the months of July and August in Greece present some moderate wind.

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This one is a close call with both destinations seeing temperatures sitting in the balmy mid- to late-twenties during the summer months. Out of the peak season, the Greek island of Crete warms up as early as May hitting around 25C, while the Algarve isn't far behind at around 22C.

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Trousers & shorts: High-waisted shorts, culottes, and wide-leg pants should be on top of your list! Also, jeans are the safest option as they are always in fashion and go well with everything for a casual classy style. Sandals: Don't forget to bring with you a pair of flat sandals, ideal for both day and night.

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