The temperature of the sea surface on the French Rivieravaries from a low of 13° C (55° F) in January to a high of 24° C (75° F) in July.
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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.
Thirty degrees and above is considered too warm for comfortable swimming by virtually all swimmers. Triathletes use a standard measurement of 24 degrees Celsius / 75 degrees Fahrenheit as the temperature up to which they are allowed to wear wet-suits. By that standard, 24 degrees is the upper limit of cold water.