Especially for swimming and snorkelling purposes during your sailing holidays in Greece, or the adjacent Ionian, Carian and Lycian coasts of Turkey.
Maps of seawater surface temperatures of Greece
All temperatures are in degrees Celsius (°C) and are averages over a period of 1850 till 2006. These temperatures are seawater surface temperatures: and therefore below the surface it can be colder.
In the maps below, the Ionian, Aegean and Turkish coastal areas have been divided into squares.
For each of the four quadrants per square an average temperature is given.
Even when a temperature is printed on land it of course concerns only the wet area of that quadrant.
It is important to realise that this unique climate data is collected from ships well offshore, so invariably the inshore temperatures experienced at beaches will be higher, in shallow secluded bays/beaches even up to 2 degrees higher!
The second half of February has the worst swimming conditions, and the second half of August has the highest seawater temperatures (~26 °C in the south-east Aegean). Remember: at the beach and in shallow anchorages the temperatures will be much higher!
The Northern Sporades, Thasos, Lesbos, Limnos, North-east greece (and North-west of Turkey) have the coldest temperatures: in August 2 or 3 degrees colder and in May almost 4 degrees colder than the Dodecanese.