SXUS43 KGRB 240441 RECGRB WIZ048-WIZ049-240545- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 1141 PM CDT Sun Aug 23 2026 .TONIGHT...North winds 5 to 10 knots. Clear. Waves 1 foot or less. Lows in the lower 50s. .MONDAY...Northwest winds up to 5 knots. Mostly 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. .TUESDAY...Southwest winds 5 to 10 knots. Mostly sunny. Waves 1 foot or less. Highs around 80. $$