Sometimes in Athens- especially during summer- like the rest of Greece, especially urban centres, there is too hot. Apart from finding air conditioning what other options are there? so it comes…. how can someone feel cool in Athens during hot Greek summer??
book a tour at a Saronikos island OR just go to Piraeus port and get the first ship to Aegina (1-1 hour and a half).
OR find a good airconditioning cafe for the day.
If you want to walk, always keep a bottle of cold water (they sell it everywhere and it is very cheap- check prices here).
Athens coastline (actually Attica coastline): try to go to seaside, either south Athens or eastern Athens and combine with your trip a visit to archaeological sites there (so as not to lose you day without learning something new). You can also visit a mountain, Immitos is closer from the other two to the city center.
Try to visit a tavern next to the sea and enjoy seafood with ouzo- what else. You can also visit Piraeus and Mikrolimano that is near the sea.
most of the clubs use aircoditioning. Before that, you can visit an Open Air Cinema, there are many in Athens.
Drink cocktails, most of the bars know their task, that is to refresh people. Athens nightlife is famous
Generally at night temperature gets lower, and if you combine it with a visit either to a hill or to a close-to-the-sea-nightclub, that would be perfect..
General tips: eat more fruits and raw vegetables, avoid fat food.