RECMKX Recreational Boater Forecast for Inland Lakes for Southeast Wisconsin National Weather Service Milwaukee/Sullivan WI 1039 CDT Sat Oct 17 2026 ...Lake Mendota... .TODAY... Waves...............Half foot to 1 foot. Sky/Weather.........Sunny. Areas of frost until 11 AM. Max Temperature.....Around 55. Winds...............Southwest winds 10 to 15 mph. Water Temperature...50 degrees. UV Index............4 - Moderate. .TONIGHT... Waves...............1.5 to 2 feet. Sky/Weather.........Clear. Min Temperature.....Around 39. Winds...............Southwest winds 10 to 15 mph. Water Temperature...50 degrees. UV Index............4 - Moderate. .SUNDAY... Waves...............1.5 to 2 feet. Sky/Weather.........Sunny. Max Temperature.....Lower 60s. Winds...............Southwest winds around 15 mph. .MONDAY... Waves...............Half foot or less. Sky/Weather.........Sunny. Max Temperature.....Mid 60s. Winds...............South winds around 5 mph. .TUESDAY... Waves...............Nearly calm. Sky/Weather.........Sunny. Max Temperature.....Upper 60s. Winds...............Southeast winds around 5 mph. Sunrise: 07:13 AM CDT Sunset: 06:13 PM CDT $$