With hordes of tourists arriving daily, a heat wave that could see temperatures hit as high as 41 degrees Celsius - some 105.8 Fahrenheit - is building across Greece, making it dangerous to be out in the midday sun.
With almost no municipal swimming pools for children and public beaches long occupied by unlawful clubs that charge as much as 10 euros ($11.18) for entry, Greeks and visitors have few alternatives to cool off unless they can afford to hit the sea.
Temperatures on June 25 shot past the 35 degrees Celsius (95 F) and were set to soar with the real feel already about 100 degrees Fahrenheit.
The weather service of SKAI TV said daytime highs in Athens will increase to near 106 degrees on the weekend of July 1-2, making it stifling.
The heat is coming from Africa, meteorologists said and sweep across other parts of Europe as well, as far as France and England.
A similar trend is expected to grip northern Greece and the eastern mainland, with daytime highs in Thessaloniki and Volos over the coming week ranging from 34-39 Celsius (93.2-102.2F,) the national weather service (HNMS) reported.
Temperatures on the islands - the favored choice of tourists who mostly shun Athens - will be four to five degrees cooler but still searing.
As usual, health officials advised people, particularly the elderly and children, to take special care, to drink water, not exert themselves and to try to stay cool even if they can’t afford air conditioning with electric rates being hit with special surcharges from the ruling Radical Left SYRIZA party.