SXUS43 KGRB 090621 RECGRB WIZ048-WIZ049-090900- Recreational Forecast for Lake Winnebago National Weather Service Green Bay WI 121 AM CDT Thu Jul 9 2026 .REST OF THE NIGHT...South winds around 5 knots. Slight chance of thunderstorms. Waves less than 1 foot. Near steady temperature in the lower 70s. .THURSDAY...South winds around 5 knots backing northeast in the afternoon. Chance of showers and slight chance of thunderstorms through the day. Waves less than 1 foot. Highs in the mid 70s. .THURSDAY NIGHT...Northeast winds around 5 knots. Patchy fog in the evening. Waves less than 1 foot. Lows in the lower 60s. .FRIDAY...Northeast winds around 5 knots. Sunny. Waves less than 1 foot. Highs around 80. $$