SXUS43 KGRB 211121 RECGRB WIZ048-WIZ049-212100- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 621 AM CDT Mon Sep 21 2026 .TODAY...Northeast winds 10 to 15 knots. Mostly cloudy. Waves 1 to 3 feet. Highs around 60. .TONIGHT...Northeast winds 10 to 15 knots. Mostly cloudy. Waves 1 to 3 feet. Lows around 50. .TUESDAY...Northeast winds 10 to 15 knots. Mostly cloudy in the morning then becoming mostly sunny. Waves 1 to 3 feet. Highs in the lower 60s. .TUESDAY NIGHT...Northeast winds around 10 knots. Mostly clear. Waves 1 to 3 feet. Lows in the upper 40s. $$