The warmest region throughout the year is the south-east Aegean: Kos, Rhodes, Bodrum and Marmaris. Except for June and July where also the Ionian, Saronic and Cyclades areas are as warm as the south-east Aegean.
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Here is a review of current sea surface temperatures around the country. Generally very warm Ionian sea and central Mediterranean, slightly 'cooler' Aegean sea. The western coast of Greece, including the islands Corfu, Lefkada and Cephalonia is very warm, with sea surface temperatures in 28-30 °C range.
The average temperature in Europe is 21.8°C. The highest current temperature on the continent according to our data, is in Koper (Slovenia) where water has 28.9 degrees celsius. On the other hand the lowest temperature is in Dalatangi (Iceland) where water has 12.1 degrees celsius.
This Little-Known Greek Island Has Gorgeous Scenery And Crystal-Clear Water. The island of Kefalonia, west of mainland Greece, may not be a household name like Santorini or Mykonos — but that's exactly why you should consider visiting.
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.
Glyfada (Corfu) water temperatures peak in the range 25 to 27°C (77 to 81°F) on around the 14th of August and are at their lowest on about the 20th of February, in the range 14 to 15°C (57 to 59°F). Year round warm water temperatures at Glyfada (Corfu) climb to their maximum in mid August.
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.
Makunufushi Island, MaldivesThe Maldives doesn't have a swimming season because the water is always warm enough (82 to 86 degrees) to dive right in and splash around. There are tons of gorgeous beaches, but we're partial to the private island of Makunufushi.
Portugal's beaches are beautiful, yes–but due to being set on the Atlantic, the water is actually much colder than many visitors might expect (yes, even in the Algarve). What is this? Spain's long Mediterranean coast, on the other hand, tends to offer much warmer water and a longer swimming season.