SXUS43 KGRB 230621 RECGRB WIZ048-WIZ049-230900- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 121 AM CDT Sun Aug 23 2026 .REST OF THE NIGHT...Northwest winds around 10 knots. Clear. Waves 1 foot or less. Lows in the upper 50s. .SUNDAY...Northwest winds around 10 knots. Sunny. Waves 1 foot or less. Highs in the mid 70s. .SUNDAY NIGHT...North winds 5 to 10 knots. Mostly clear. Waves 1 foot or less. Lows in the lower 50s. .MONDAY...Northwest winds around 5 knots. Sunny. Waves 1 foot or less. Highs in the mid 70s. $$