Although no complete set of records exist, the warmest sea surface temperature is currently thought to be 37.6C (99.7F) recorded in Kuwait Bay in the Persian Gulf.
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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.
As a result, water temperatures in the Caribbean Sea can reach quite high levels, with averages ranging from 26°C to 29°C (78°F to 84°F) during the summer months. In certain areas, water temperatures can occasionally reach around 32°C (90°F) during particularly warm periods.
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.
Sea Temperatures in SpainThe warmest water in Spain is in Menorca where water has 26.8 degrees celsius. On the contrary, the lowest temperature is in San Sebastian where water has only 14.6 degrees celsius.
Nissi Bay Beach, Ayia Napa, CyprusIt's located on the island of Cyprus, which is known to have some of the clearest waters in all of Europe. A tiny strip of soft, pale sand divides two sections of light blue shallows, ensuring picturesque views no matter where you set up camp.
Currents coming from the Atlantic Ocean, right from the strait of Gibraltar, cool down our sea water. February has in fact the coldest sea temperature of the year, 13ºC/55ºF.
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.