GFS has been pretty consistent in forecasting a very wet Thursday for much
of central and southern Greece. I have personally never seen any ensemble
like the current one: http://www.wetterzentrale.de/pics/MT8_Athen_ens.gif .
It should be quite wet indeed at places favoured by orography, as wind
shear, èe temperatures and other instability factors are forecast to be
favourable for some heavy stuff.
Meantime, temperatures have dropped since the NElies settled in. Afternoon
temperatures here on Monday +22C, Tuesday +13C.

Yannis, SE Athens
+12.5C, RH 55%, SLP 1024.2 hPa
http://www.e-kairos.gr/everyday/october03.html