textproduct: Chicago

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

KEY MESSAGES

- Seasonable temperatures with dry conditions are expected through much of the upcoming week.

DISCUSSION

Issued at 100 PM CDT Sun Oct 4 2026

There is not cloud in the sky according to GOES visible satellite imagery. Temperatures have increased accordingly, despite a cold front passing through the area, with upper 60s and low 70s currently. High temperatures should end up in the mid 70s with isolated spots south of I-80 with a chance to touch the upper 70s. These clear skies will remain through the overnight allowing for better radiational cooling and dropping temperatures down into the low 40s with typical colder spots possibly falling into the upper 30s.

While surface high pressure is expected over Chicagoland, broad northwest flow will remain in place through the coming week. Seasonable temperatures can be expected through much of the week with a slight warmer bump in temps mid week as winds turn southwest for a moment. A few weak perturbations may traverse the northwest flow late Tuesday into Wednesday and again on Thursday. Not only have models consistently been showing the core of these systems remaining over Wisconsin, but they appear fairly moisture starved. While a sprinkle cannot be completely ruled out, PoPs remain below any formal mention in the forecast. This dry and seasonable trend looks to remain in place through next weekend.

AVIATION /18Z TAFS THROUGH 00Z TUESDAY/

Issued at 1220 PM CDT Sun Oct 4 2026

There are no key concerns for the 18Z TAF period.

NW winds near to just over 10 kt this afternoon will subside for this evening. Monday will begin with light NNW'erlies before they should favor a NNE direction by the mid-late morning. Much of the late morning and afternoon could be spent teetering on either side of northerly at below 10 kt before kicking over to more easterly in the late afternoon and evening. Expect VFR through the period.

Doom

LOT WATCHES/WARNINGS/ADVISORIES

IL...None. IN...None. LM...Small Craft Advisory from 1 AM to 10 AM CDT Monday for Burns Harbor to Michigan City IN.

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