NOAA’s weather forecast specifically forecasts weather over the lake as opposed to the forecast in the town of Sheboygan. I have found the wave forecast to be the most accurate means of predicting wave heights at any given time. Wind, fog, and precipitation is also part of the forecast.
Windfinder.com is a “Go-To” for forecasting if fishing trips will be safe and comfortable in Sheboygan. Use the free version to get wind forecasts for every three hours, or choose to pay the fee for a subscription and up to the hour forecasts.