Cold Air Brings Lake Effect Showers to Green Bay

North winds over Great Lakes waters are producing rain and snow showers in Door and Kewaunee counties through Friday night.

Updated on Nov. 12, 2026 in Current Conditions

Gray lakeshore with rocky limestone edges, light snow showers drifting over cold water beside a dark cedar treeline under an overcast sky. — Cold air pushing across Lake Michigan is bringing rain and snow showers to Door and Kewaunee counties near Green Bay through Friday night. AI Illustration. Upload story photo >

A cold air mass has moved into the Green Bay area, with north winds over relatively warm Great Lakes waters producing rain and snow showers in Door and Kewaunee counties. Today's and tomorrow's high temperatures are forecast at 41 degrees.

Why it matters

Cold, showery conditions affect commuting, outdoor plans and weekend events across the Green Bay area. Ground temperatures remain warm, so some slushy accumulation is possible while most snow melts on contact.

The forecast combines daily high temperatures of 41, 41, 44 and 46 degrees with kickoff temperatures near 34 degrees for semi-final games. The exact amount of slushy accumulation and the precise timing of heaviest showers remain unspecified.

The details

North winds over relatively warm Great Lakes waters are generating lake effect rain and snow showers in Door and Kewaunee counties. Forecasters expect mostly cloudy skies, with showers ending Friday night and a warmer, mostly sunny Sunday.

Today (November 12, 2026): Mostly cloudy, windy and colder with lake effect showers over Door County.
Tomorrow (November 13, 2026): Mostly cloudy with lake effect rain and snow showers over Door County.
Friday night (November 13, 2026): Rain and snow showers end over Door and Kewaunee counties.
Saturday (November 14, 2026): Becomes mostly cloudy with a high of 44 degrees.
Sunday (November 15, 2026): Packers play the Vikings at Lambeau Field, with a noon kickoff.

Seasonal Patterns

This event follows the familiar late-autumn pattern of lake effect showers, in which cold northerly air crossing relatively warm Great Lakes waters produces precipitation downwind. The mechanism is most common in the transition from fall into early winter, when lake temperatures remain above air temperatures.

Drivers and pedestrians should expect slick, slushy spots during Friday's showers and watch for reduced visibility on local roads. Fans heading to Lambeau Field for Sunday's noon kickoff should plan for temperatures in the mid-40s and dress in layers.

The takeaway

Lake effect showers can leave light slush even when ground temperatures are warm, so check local forecasts before traveling through Door and Kewaunee counties this week. Dressing in layers helps for both the chilly mornings and milder afternoons.