GREEN BAY, Wis. – A dense, misty fog rolled through northeastern Wisconsin early this Halloween morning, muting headlights and slicking roads across stretches of Highway 41 and rural Brown County. Drivers heading out before sunrise should slow down — the fog could freeze on bridges and sidewalks as surface temperatures flirt with the freezing mark.
According to the National Weather Service in Green Bay, patchy fog may linger through midmorning Friday before a weak system pushes light showers east. While widespread hazards are unlikely, even minor icing is possible where damp pavement meets near-freezing air. Visibility may fall below a half mile at times, especially north of the Fox River Valley.
By Saturday, sunshine returns with highs in the upper 40s — crisp and calm, ideal for late-season yardwork or trick-or-treat cleanups. Lows drop again into the low 30s, setting up another round of light frost across inland valleys. Sunday brings a brief warm-up into the low 50s before clouds increase again, signaling a rain chance Sunday night.
Meteorologists say this pattern — alternating calm, sunny spells and chilly, moisture-laden nights — is an early sign of winter’s slow approach across northern Wisconsin. Residents are encouraged to clear gutters, prep snow shovels, and check vehicle antifreeze ahead of the next true cold front, which models suggest may arrive later next week.
Daylight saving time ends at 2 a.m. Sunday, so clocks — and early risers — will reset under a bright, brisk sky marking the start of November.
Five-Day Forecast for Green Bay, WI:
Fri: 52/36 – Patchy fog early; slight rain chance later.
Sat: 48/30 – Mostly sunny; brisk northwest breeze.
Sun: 50/40 – Mostly sunny early; rain possible late.
Mon: 55/34 – Sunny and mild; light west winds.
Tue: 53/41 – Mostly cloudy; brief light rain possible north.
