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Below are some Ontario windsurfing links you may find helpful. I think a lot of Toronto windsurfers head up to Lake Simcoe which is about an hour north of Toronto, near Barrie. I don't know about sailing in Toronto or west of the City except that there's good sailing on Lake Erie and Lake Huron.. Don't worry, no matter where you sail in Ontario (except maybe parts of Lake Superior) the water temperature is not 1-2 degrees C in the summer. The only time of the year that it is that cold is just after the ice leaves. In the summer you can end sailing with shorts, a shortie or a steamer depending on the air temperature.
Toronto Area:
Barrie Winsurfing Association http://www.bconnex.net/~bwr/
Toronto Windsufing Club http://reality.sgi.com/csp/twc/index.html
East of Toronto:
(1.5 - 2hrs East of Toronto) Picton, Ontario windsurfing website http://www.cyberslate.ca/extreme
(2.5 hrs East of Toronto)Kingston Boardsailing Association http://www.geocities.com/kingstonboardsailing/
(5 hrs east North East of Toronto)Ottawa Windsurfing website
http://www.magma.ca/~slaby/wind/
Jim