RECMKX Recreational Boater Forecast for Inland Lakes for Southeast Wisconsin National Weather Service Milwaukee/Sullivan WI 1532 CDT Wed Apr 22 2026 ...Lake Mendota... .TONIGHT... Waves...............Half foot or less. Sky/Weather.........Sunny until 11 PM, then partly cloudy. Min Temperature.....Around 55. Winds...............Southeast winds 5 to 10 mph. Water Temperature...55 degrees. UV Index............7 - High. .THURSDAY... Waves...............1.5 to 2 feet. Sky/Weather.........Mostly sunny. Max Temperature.....Around 79. Winds...............South winds 10 to 15 mph. Water Temperature...55 degrees. UV Index............7 - High. .THURSDAY NIGHT... Waves...............1.5 to 2 feet. Sky/Weather.........Partly cloudy then becoming mostly cloudy. Chance of thunderstorms through the night. Showers after midnight. Min Temperature.....Around 60. Winds...............South winds around 10 mph. .FRIDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Mostly cloudy then becoming mostly sunny. Showers likely and slight chance of thunderstorms. Max Temperature.....Upper 60s. Winds...............West winds around 10 mph. .SATURDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Mostly sunny. Max Temperature.....Mid 60s. Winds...............Northeast winds 5 to 10 mph. Sunrise: 06:04 AM CDT Sunset: 07:48 PM CDT $$