For safety's sake, most swimmers should wait until the water temperature reaches at least 70 degrees Fahrenheit.
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Temperatures throughout Greece can vary, but May is a good choice for heat and sun in moderation. Temperatures: Average highs of 24 degrees celsius, average lows of 10C. Rainfall: Ranges between 13mm per month in Crete to 31mm in Corfu. Sunshine hours: Nine hours per day.
Expect the Greece temperature in May to average maximum temperature of 73°F (23°C), with around 10.5mm of rain and nearly 12 hours of sunshine. The beginning of May is a little cooler, and the heat ramps up towards the end of the month.
The hottest city in Europe in May is Seville (27°C) in southern Spain, followed by Antalya (26°C) in southern Turkey. The islands of Crete, Malta and Cyprus will also feel hot at 24°C, along with Valencia and the Costa de la Luz (24°C) in Spain.
The Indian Ocean is ideal for beach holidays in May. Choose between the Maldives, Mauritius and the Seychelles. May is a good month to visit Japan. Temperatures in the capital Tokyo are mild, the country's gardens are in full bloom and the mountains are green.