Hi from Nico, Venice, Italy
There are mainly two winds in the famous north part of Lake Garda.
The Peler that blows from north since the early morning until not more than 9-10 a.m. The best place to go out is Malcesine on east side, it's a town in Veneto near the boarder of Trentino, little more south than Riva and Torbole.
And then the Ora, the wind from the south, starting about at noon, 1 p.m., usually unfortunately lighter in august when it's too hot. Best place is Torbole and especailly Conca d'Oro, 2 km south from Torbole town, or some spot on the rocky west coast. Beside Segnana surf center there is a parking ground, you can rig on grass and there's wi-fi free on all area.
If you book on Hotel Pier center you can go from bed to windsurf directly.