SXUS43 KGRB 220231 RECGRB WIZ048-WIZ049-220345- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 931 PM CDT Fri Aug 21 2026 .TONIGHT...West winds 5 to 10 knots veering northwest after midnight. Chance of thunderstorms late in the evening. Waves 1 to 2 feet. Lows in the lower 60s. .SATURDAY...Northwest winds 10 to 15 knots. Chance of thunderstorms in the afternoon. Waves 1 to 2 feet. Highs in the upper 70s. .SATURDAY NIGHT...Northwest winds around 10 knots. Chance of thunderstorms in the evening. Waves 1 to 2 feet. Lows in the upper 50s. .SUNDAY...Northwest winds 5 to 10 knots. Sunny. Waves 1 foot or less. Highs in the mid 70s. $$