textproduct: Chicago

KEY MESSAGES

- An extended period of dry and above to much above average temperatures through the next 7 days.

DISCUSSION

Issued at 1209 PM CDT Sun Oct 18 2026

Breezy southwesterly winds will abate around sunset early this evening. Another chilly night is anticipated as clear skies and light winds allow temperatures to drop into the mid-to-upper 30s and low 40s overnight, outside of the warmer Chicago metro area. Patchy frost may develop towards morning in the coldest locations; however, another Frost Advisory is not planned.

Following Monday's cool start, sunny skies and lighter winds will allow temperatures to warm quickly through the morning, reaching highs in the mid-to-upper 60s, with a few low 70s possible south of I-80. Dry and unseasonably mild weather will persist for the foreseeable future as high pressure dominates across the Great Lakes. This will bring an extended stretch of pleasant late October weather, with daily highs ranging from the upper 60s to mid-70s (slightly cooler near the lake) under mostly sunny skies. While these temperatures are well above average for late October (around 60 degrees), they remain comfortably below record highs in the mid-to-upper 80s.

KJB

AVIATION /00Z TAFS THROUGH 06Z TUESDAY/

Issued at 622 PM CDT Sun Oct 18 2026

No significant aviation forecast concerns.

VFR, nearly cloudless conditions are expected through the forecast period. Winds are expected to remain light southerly tonight into Monday, eventually shifting light east-southeast with a weak lake breeze at ORD/MDW later Monday afternoon and east-northeast at GYY. Winds will likely remain light easterly or just go light/variable Monday night at all sites.

Ratzer

LOT WATCHES/WARNINGS/ADVISORIES

IL...None. IN...None. LM...None.