Generally the liquid is water and the fluid above the liquid is air. The molecules within the liquid attract each other and at the interface there are more attractive forces towards the bulk of the liquid than there are towards the adjacent gas molecules. The molecular forces tend to pull into the fluid bulk.
Weather lowdown. Despite the fact that the month of September in Athens can produce summer-like temperatures, the weather starts to cool off significantly in October, and especially at night. The average temperature this month is 19Â°C (66Â°F), while the average low is 15Â°C (59Â°C), and the average high is 23Â°C (73Â°F).
Weather in Athens, Greece. When to Come to Athens. When to come to Greece depends on the type of person you are and also when you are able. I am one of those people who thinks that anytime is a good time to come to Greece. Every seasons has its charm and every season has its drawbacks. July and August are fine if you are prepared.