Also try weather.com and type in the closest city to your departure point.
Here is a link to Port Clinton. The detailed part of the hour by hour is usually pretty close. Also the ten day forecast is fairly close for the first 3 days. Remember to add a little to the wind speeds as the wind speeds given are for land and not open water. I usually add 5 mph to the wind speed just to be safe. You can also change the city at the top of the page.

http://www.weather.com/weather/local...rchbox_localwx

Wakina