Athens is a summer habit to attend open cinemas, that are seasonally open. There are so many and offer different kind of options, and of course they are everywhere in Athens. Here is a list according to location.
Athens historical center
Plaka – Cine Paris http://www.cineparis.gr/
Thisseio- Cine Thisseio http://cine-thisio.gr/
Syntagma- cine aigli http://www.aeglizappiou.gr/cine_uk.html
Kolonaki – cine dexameni https://cinedexameni.gr/