RECMKX Recreational Boater Forecast for Inland Lakes for Southeast Wisconsin National Weather Service Milwaukee/Sullivan WI 317 CDT Sun Mar 29 2026 ...Rock Lake... .TODAY... Waves...............1 to 1.5 feet. Sky/Weather.........Mostly cloudy until 5 PM, then mostly sunny. Max Temperature.....Around 64. Winds...............Southwest winds 10 to 15 mph. Water Temperature...44 degrees. UV Index............4 - Moderate. .TONIGHT... Waves...............Half foot to 1 foot. Sky/Weather.........Mostly clear. Min Temperature.....Around 46. Winds...............South winds 5 to 10 mph. Water Temperature...44 degrees. UV Index............4 - Moderate. .MONDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Mostly sunny. Max Temperature.....Mid 70s. Winds...............South winds 5 to 10 mph. .TUESDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Mostly cloudy. Rain likely and chance of thunderstorms. Max Temperature.....Upper 60s. Winds...............Southwest winds around 15 mph shifting to the northwest in the afternoon. .WEDNESDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Partly sunny. Max Temperature.....Mid 40s. Winds...............Northeast winds around 10 mph. Sunrise: 06:42 AM CDT Sunset: 07:19 PM CDT $$