SXUS43 KGRB 220141 RECGRB WIZ048-WIZ049-220245- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 841 PM CDT Fri Aug 21 2026 .TONIGHT...Southwest winds up to 10 knots veering northwest around 10 knots after midnight. Chance of thunderstorms early 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. $$