RECMKX Recreational Boater Forecast for Inland Lakes for Southeast Wisconsin National Weather Service Milwaukee/Sullivan WI 1040 CDT Fri Oct 3 2025 ...Lake Koshkonong... .TODAY... Waves...............Half foot or less. Sky/Weather.........Sunny. Max Temperature.....Around 88. Winds...............Southwest winds 5 to 10 mph. Water Temperature...71 degrees. UV Index............5 - Moderate. .TONIGHT... Waves...............Half foot to 1 foot. Sky/Weather.........Mostly clear. Min Temperature.....Around 61. Winds...............South winds around 5 mph. Water Temperature...71 degrees. UV Index............5 - Moderate. .SATURDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Sunny. Max Temperature.....Upper 80s. Winds...............South winds around 10 mph. .SUNDAY... Waves...............1.5 to 2 feet. Sky/Weather.........Sunny. Max Temperature.....Mid 80s. Winds...............South winds around 15 mph. .MONDAY... Waves...............Half foot to 1 foot. Sky/Weather.........Partly sunny. Slight chance of thunderstorms in the morning. Chance of showers through the day. Max Temperature.....Lower 70s. Winds...............Northwest winds around 5 mph. Sunrise: 06:55 AM CDT Sunset: 06:35 PM CDT $$