Weather
Wisconsin Fog Alert: ¼-Mile Visibility, Then 54° Monday Oct 23-26
Green Bay, WI – Dense fog reducing visibility to one quarter mile or less is creating potentially hazardous driving conditions across northeastern and east central Wisconsin Friday morning, October 23
By Evan Cross · 2026-10-23T10:37:32.723Z
Green Bay, WI – Dense fog reducing visibility to one quarter mile or less is creating potentially hazardous driving conditions across northeastern and east central Wisconsin Friday morning, October 23. The National Weather Service has issued a Dense Fog Advisory affecting Green Bay, the Fox Valley and numerous surrounding communities until 9 a.m. CDT. Although improving visibility and warmer temperatures are expected later Friday, another round of fog remains possible Saturday morning before a noticeable cooling trend arrives early next week.
According to the National Weather Service in Green Bay, the advisory covers portions of north central, northeastern and east central Wisconsin, including Brown, Outagamie, Winnebago, Manitowoc, Oconto and Door counties. Communities such as Green Bay, Appleton, Oshkosh, Manitowoc, Two Rivers and Sturgeon Bay are included in the affected area. At Austin Straubel International Airport, visibility was reported at just one quarter mile at 4:53 a.m. Friday, with fog, calm winds and a temperature of 49 degrees.
Dense Fog Creates Friday Morning Travel Concerns The most immediate concern is reduced visibility along major transportation corridors, including Interstate 41, Interstate 43 and U.S. Highway 10. Drivers may encounter rapidly changing visibility, particularly in low lying areas and locations where moisture remains trapped near the ground. The Weather Service advises motorists to reduce speed, use headlights and increase following distances while the advisory remains in effect.
Conditions are expected to improve through Friday morning as fog gradually dissipates. The Green Bay forecast calls for areas of dense fog before 10 a.m., followed by clearing skies and an afternoon high near 69 degrees. Winds should remain relatively light, becoming southerly around 6 mph during the afternoon. The improving weather could provide a more comfortable afternoon for outdoor activities after the difficult morning commute.
Another Fog Risk Before Temperatures Drop Saturday, October 24, could bring additional visibility concerns, particularly across eastern Wisconsin. The Weather Service's hazardous weather outlook identifies the possibility of dense fog early Saturday morning, although the supplied outlook does not establish another advisory. Residents traveling before sunrise should check updated conditions, especially near the Fox Valley and communities along Lake Michigan.
Temperatures will remain relatively mild Saturday, with Green Bay reaching approximately 68 degrees under mostly cloudy skies. Southerly winds of 5 to 10 mph could produce gusts as high as 20 mph. Saturday night remains mostly cloudy, with temperatures falling near 55 degrees before another mild afternoon Sunday.
Sunday, October 25, is expected to reach 66 degrees, continuing the stretch of relatively comfortable late October temperatures. However, the pattern begins changing Sunday night as temperatures fall to approximately 47 degrees. By Monday, October 26, the afternoon high is projected to reach only 54 degrees, representing a 12 degree decline from Sunday's high and a 15 degree decrease from Friday's forecast high.
Cooler Weather Arrives Early Next Week Monday's cooler temperatures will be accompanied by mostly cloudy skies, with overnight readings falling near 42 degrees. Although this represents a noticeable shift from the weekend, the supplied forecast does not indicate freezing temperatures or accumulating snow in Green Bay through Thursday.
Tuesday, October 27, brings a 20% chance of showers before 1 p.m., with temperatures remaining near 54 degrees. A similar 20% precipitation probability continues Tuesday night, while Wednesday offers some improvement with partly sunny skies and a high near 62 degrees.
Residents should remain particularly attentive to changing visibility Friday morning and any renewed fog development Saturday. Motorists can check Wisconsin 511 for road conditions and the National Weather Service for updated advisories.
Will the cooler temperatures expected Monday change your plans, or is the dense fog your biggest concern for weekend travel?
Five Day Weather Outlook Friday 10/23: Areas of dense fog before 10 a.m. give way to gradual clearing and sunshine, with temperatures reaching 69 degrees and southerly winds near 6 mph; Friday night turns partly cloudy with a low near 51 degrees.
Saturday 10/24: Mostly cloudy skies dominate with a high near 68 degrees and south winds of 5 to 10 mph, gusting to 20 mph; dense fog remains possible early in parts of eastern Wisconsin, with nighttime lows near 55 degrees.
Sunday 10/25: Mostly cloudy conditions continue across Green Bay with a high near 66 degrees and southwest winds around 5 mph, becoming light during the afternoon; temperatures fall to approximately 47 degrees Sunday night.
Monday 10/26: Cooler air settles across northeastern Wisconsin as mostly cloudy skies accompany a high near 54 degrees, approximately 12 degrees below Sunday's high, before temperatures decline to around 42 degrees Monday night.
Tuesday 10/27: Mostly cloudy skies continue with a 20% chance of showers before 1 p.m. and a high near 54 degrees; another 20% chance of showers follows Tuesday night as temperatures fall to approximately 45 degrees.
Extended Weather Outlook Wednesday, October 28, should bring partly sunny skies and a high near 62 degrees. Wednesday night carries a 30% chance of showers, with a low near 48 degrees.
Thursday, October 29, is expected to remain partly sunny with a high near 61 degrees and a 20% chance of showers.
The supplied outlook does not indicate a significant winter storm, accumulating snowfall or freezing temperatures for Green Bay through Thursday. No additional six to 10 day outlook data was provided.