I also like this page from NOAA. Gives lots of info like wave, wind, weather and temps plus forecasts for each. Just not good details for LSC. You can click on the map by Lake Erie and zoom in a little though.
75....but like LakeNewbie said, kids will go in the water @ any temp. Try little muscamoot if your boat can get in there...its always warmer in there, if not, the water in front of Mac Rays tends to run a little warmer.