SXUS43 KGRB 181552 RECGRB WIZ048-WIZ049-182100- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 1052 AM CDT Mon May 18 2026 .TODAY...Southwest winds 5 to 10 knots. Slight chance of thunderstorms late in the morning, then chance of thunderstorms in the afternoon. Waves 1 foot or less. Highs in the mid 70s. .TONIGHT...South winds 5 to 15 knots. Chance of thunderstorms through the night. Showers likely after midnight. Waves 1 foot or less. Lows in the lower 60s. .TUESDAY...West winds 15 to 20 knots. Chance of thunderstorms in the morning, then slight chance of rain showers in the afternoon. Waves 1 to 3 feet. Highs in the mid 60s. .TUESDAY NIGHT...Northwest winds 10 to 15 knots. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 foot or less. Lows in the mid 40s. $$