RECMKX Recreational Boater Forecast for Inland Lakes for Southeast Wisconsin National Weather Service Milwaukee/Sullivan WI 317 CDT Sat May 2 2026 ...Sinissippi Lake... .TODAY... Waves...............Nearly calm. Sky/Weather.........Mostly sunny. Areas of frost until 11 AM. Max Temperature.....Around 56. Winds...............West winds up to 5 mph. Water Temperature...39 degrees. UV Index............5 - Moderate. .TONIGHT... Waves...............Half foot to 1 foot. Sky/Weather.........Partly cloudy until 5 AM, then mostly cloudy. Min Temperature.....Around 40. Winds...............Southwest winds 5 to 10 mph. Water Temperature...39 degrees. UV Index............5 - Moderate. .SUNDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Mostly cloudy then becoming mostly sunny. Chance of showers. Max Temperature.....Mid 60s. Winds...............Southwest winds 10 to 15 mph. .MONDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Mostly sunny. Max Temperature.....Lower 70s. Winds...............Southwest winds around 15 mph. .TUESDAY... Waves...............Nearly calm. Sky/Weather.........Mostly cloudy. Chance of showers. Max Temperature.....Upper 50s. Winds...............Northwest winds 5 to 10 mph. Sunrise: 05:45 AM CDT Sunset: 07:58 PM CDT $$