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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Secondly, the waters in Greece never get as warm as the Caribbean. The Mediterean is much cooler. You can swim in May, especially townards the end of the month, but expect cooler water.
Greece in JuneIt's warm enough around the country now to swim in the sea, in fact… you'll want to. With highs of 28°C / 81°F, lows of 21°C / 50°F and an average daily temperature of 24°C / 75°F, this is a great time to visit the Greek Islands.
Greek islands which are smaller and less touristic have a shorter season, larger islands like Crete, Corfu and Santorini have extended seasons sometimes up to full year. Hotels have different opening/closing dates but the general rule for islands is that they open in April and close at end October.
The best time to visit the Greek islands, like Santorini, Mykonos, Corfu and Kefalonia (Argostoli), is in October when the weather is still warm and the crowds are few. The Greek islands are an all-year-round vacation destination, with temperatures ranging from 50°F (10°C) to approximately 100°F (38°C).
Tourist season in Greece is roughly Easter through October. Peak season is summer, when Athens is packed with tourists, and hotel prices can be high. July and August are the hottest. The best time to visit is late spring (May) and fall (Sept–Oct).
The best month to visit Greece and experience unique traditions: February-April (in 2023) You probably know that Greeks love their traditions. There are unique and eccentric celebrations taking place throughout the year and throughout the country, not to mention the local customs specific to every place.
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).
With average daily high temperatures in the mid-70s Fahrenheit, it's usually still warm enough in early October to sunbathe in comfort and to dine outside at night, with little chance of rain. By mid-October the Ionian and Aegean seas are cooling quickly; if you love to swim, go early in the month.
Greece is glorious all year round and in October you can enjoy high temperatures and sea that won't chill the bone when swimming. Kos, for example, has an average high of 26ºC to go with 8 hours of sunshine.
And, yes, you can also swim in Santorini in October. In fact, the sea is sometimes even warmer than in June! Plus, you get a little extra when visiting the island's shores as October is a low-tourism month.
Kos. Due to its southerly location, Kos is consistently one of the hottest Greek islands. In October, the sea will be a pleasant 23ºC, with evening temperatures rarely falling below 15ºC. Only 4-5 days are likely to be affected by rain.
There will still be stuff open, many places don't close down until end October, but it depends very much what island, for example Rhodes will keep going longer than some off the beaten track little island.
All you need is some light sweater and some heavier in case it gets cooler at nights.Do wear your shorts that's how we are used to seeing our guests around but we have to be a little bit more formally dressed because we go to work; When we are on vacation we wear shorts too.
Head to the Athenian Riviera in May and the sea may be warm enough for many to enjoy as well. Islands like Crete and destinations in the Peloponnese are rather balmy now providing an ideal time for lounging on golden sands and swimming in the aquamarine sea.
The average high temperature for the day is 75 degrees Fahrenheit. Early October is normally already warm enough to comfortably sunbathe and dine outside at night, with little chance of rain. The Ionian and Aegean seas are rapidly cooling by mid-October; if you enjoy swimming, go early in the month.