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The month of May in Athens sees spring in full gear, along with the first signs of the summer heat. The average temperature this month is 20°C (68°F), while the average low is just 15°C (59°F), and the average high rises to 24°C (75°F). The beginning of May brings sunny days, with virtually no rain, and an average daily temperature of 17°C (63°F). The middle of the month sees even more sunny days, no chance of rain, and an increase in the average daily temperature to 20°C (68°F). The end of May follows this trend, as the days are filled with sunshine and no threat of rain, while the temperature continues to get warmer, with an average daily temperature of 22°C (72°C). The lowest ever recorded temperature in May in Athens is 7°C (45°F), while the highest ever recorded temperature is 33°C (91°F).

Along with warmer temperatures, May sees an increase in sunshine as well. The average daily sunshine this month is 10 hours, which is tied with July and August for the months with the most average sun in Athens. Going hand-in-hand with more sun, is a decrease in rain. The average rainfall in May drops to just 20mm spread out over four days. This is a miniscule amount, as rain this month is rare.

The increase in sun and warmer temperatures also helps bring the average sea temperature in May to 19°C (66°F). While this is a significant increase from the average in April (16°C/61°F), the water will likely still feel relatively cool to most, although it is warm enough to enjoy.

Athens is not a humid place during anytime of the year, and levels in May are among the lowest. The average humidity this month is 60%, which is comfortable and largely unnoticeable, even with warmer temperatures in May. There is an average of just one snow/fog day a year this month, so don’t pack your snow boots or worry about not being able to enjoy a view of the coastline while at the beach.