SXUS43 KGRB 201826 RECGRB WIZ048-WIZ049-202100- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 126 PM CDT Sun Sep 20 2026 .THIS AFTERNOON...Northeast winds 15 to 20 knots. Mostly cloudy. Waves 1 to 3 feet. Near steady temperature in the mid 60s. .TONIGHT...Northeast winds 15 to 25 knots. Mostly cloudy. Waves 3 to 5 feet. Lows in the mid 50s. .MONDAY...Northeast winds 10 to 15 knots. Mostly cloudy. Waves 2 to 4 feet. Highs around 60. .MONDAY NIGHT...Northeast winds 10 to 20 knots. Mostly cloudy. Waves 2 to 4 feet. Lows in the upper 40s. $$