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.
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The hottest ocean area is in the Persian Gulf, where water temperatures at the surface exceed 90 degrees Fahrenheit in the summer. Another hot area exists in the Red Sea, where a temperature of 132.8 degrees Fahrenheit has been recorded at a depth of about 6,500 feet.
The warmest water temperature is in September with an average around 67.8°F / 19.9°C. The coldest month is March with an average water temperature of 59°F / 15.0°C.
Real Experiences. While official figures might indicate certain temperatures, personal experiences can vary. On some days, after a long hike on the cliffs of the Algarve, the sea feels refreshingly cold, while on others, especially in sheltered coves, it feels considerably warmer.
The graph below shows the range of monthly Santa Cruz de Tenerife water temperature derived from many years of historical sea surface temperature data. The warmest water temperature is in September with an average around 74.7°F / 23.7°C. The coldest month is March with an average water temperature of 66.6°F / 19.2°C.
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.
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.
Mallorca - Cala Major sea temperatures peak in the range 25 to 28°C (77 to 82°F) on around the 18th of August and are at their lowest on about the 1st of March, in the range 13 to 14°C (55 to 57°F). Year round warm sea temperatures at Mallorca - Cala Major climb to their maximum in the third week of August.