O.K. Santorini. Here you go.
<http://www.sailingissues.com/yachting-guide/interactive-maps-of-greece.html>
<http://www.poseidon.ncmr.gr/weather_forecast.html>
This next one is in Greek. But if you can navigate your way around it, it's a good site.
<http://www.meteo.gr/SailingMapF.asp>