MILWAUKEE, Wisconsin – Cold air is slipping in over Wisconsin this Wednesday morning, crisp and steady off Lake Michigan. The last of the midweek showers will fade, giving way to clearing skies and a calm chill that deepens by Thursday night. For many residents from Janesville to Sheboygan, the first real taste of late fall is on the doorstep.
According to the National Weather Service in Milwaukee/Sullivan, a Frost Advisory remains in effect for parts of south-central and eastern Wisconsin. Temperatures will dip into the mid-30s by early Thursday, and widespread frost is likely by Friday morning. The agency warns of a potential hard freeze in rural areas—especially inland from the lake and north of I-94—where temperatures could briefly touch the lower 30s.
Drivers along I-43 and I-39 may encounter frosted windshields and slick spots before sunrise Friday. Gardeners are urged to cover sensitive plants, and farmers should protect late-season crops and equipment. Winds will ease to near calm, setting up perfect radiational cooling under mostly clear skies.
Daytime weather, however, remains calm and bright. Highs Thursday and Friday will reach the lower 50s with dry, refreshing air—ideal for outdoor cleanup or early Halloween decorating. By Saturday, sunshine dominates again, though clouds may edge back in Sunday with a slight chance of light showers.
After this chill, attention turns northward. Forecast models hint at possible early flakes near Wisconsin’s Upper Peninsula border next week—a quiet but telling sign that winter’s first whispers are drawing near.
Five-Day Forecast for Milwaukee, WI:
Wed: 49/43 – Breezy; scattered showers taper late.
Thu: 51/35 – Mostly sunny; frost develops late.
Fri: 54/37 – Areas of frost early; sunny and cool.
Sat: 57/44 – Mostly sunny; calm winds.
Sun: 58/46 – Increasing clouds; 20% chance of showers.
