If you're looking for summer vibes, the best time to travel to Athens is in June, July and August, when the average temperature reaches 28.7 °C, while October, September and May are the 3 sunniest months of the year, with an average of 156.1 hours.
However, if you prefer colder temperatures, make sure you visit Athens during January, February or November to experience an average of 4.19 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during January, March and July, when the average precipitation in Athens is 9.75 mm, while the months of January, February and March are drier, with an average of 0 mm.