SXUS43 KGRB 231821 RECGRB WIZ048-WIZ049-232100- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 121 PM CDT Sun Aug 23 2026 .THIS AFTERNOON...Northwest winds around 10 knots. Mostly sunny. Waves 1 foot or less. Highs in the mid 70s. .TONIGHT...North winds 5 to 10 knots. Mostly clear. Waves 1 foot or less. Lows in the lower 50s. .MONDAY...Northwest winds up to 5 knots. Sunny. Waves 1 foot or less. Highs in the mid 70s. .MONDAY NIGHT...Southwest winds up to 5 knots. Partly cloudy. Waves 1 foot or less. Lows in the upper 50s. $$