The main weather pattern in Saronic Bay in July, is a sea breeze that start very light at around 11:00 and builds up strength until it peaks to around 15 to 20 knots, depending on the temperature of the day, around 15:00 and then decreases slowly until around 18:00. This sea breeze comes from a Southerly direction.
A secondary pattern can develop if the temperature on the day is low enough and there is a very strong Northerly wind, above force 5, in the Aegean Sea, then it can spill over the mountains into Saronic Bay.
There is no tide or any notable currents in the Saronic Bay.
Information provided by Nautical Club of Kalamaki.