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

- An extended period of drier weather with seasonable temperatures through the middle of next week

DISCUSSION

Issued at 126 PM CDT Fri Oct 2 2026

The front that brought yesterday's rainfall continues to move east of the region. Higher clouds remain over potions of north- central Indiana, but will gradually move east through the evening. There is a narrow band of convergence that extends from southern Lake Michigan down to Gibson City, Illinois resulting in mid-level cumulus clouds. Clearer skies extend northwest of the area as today marks the first of several with drier conditions developing.

Winds remain out of the northeast around 10 mph, and are expected to diminish after sunset. With clearer skies, light winds, and cooling temperatures, there is a chance for patchy shallow fog for areas away from the Chicago Metro. Widespread dense fog is not expected, but satellite trends will need to be monitored overnight. Otherwise, the northerly flow will advect in a cooler air mass knocking temperatures down into the 40s tomorrow morning; though it would not be surprising if a few isolated rural spots touched the upper 30s.

Seasonable temperatures look to set-up through the week next week with high temperatures in the 60s and low 70s and overnight lows in the 40s and 50s. Ensemble models are showing some consistency with a couple of fronts passing through the western Great Lakes: one on Sunday, the other in the middle of the week. It is possible that an isolated light rain or sprinkle develops from it, but as most models favor this remaining in Wisconsin as it passes over, it may only be the northernmost tier of Illinois counties south of the Wisconsin state line that has the best (albeit low) chance for some rain drops. Otherwise, the extended forecast keeps us precipitation free.

AVIATION /18Z TAFS THROUGH 00Z SUNDAY/

Issued at 1234 PM CDT Fri Oct 2 2026

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

NNE winds at 10 to 20 kt this afternoon will subside to below 10 kt this evening before veering to SE late tonight, possibly going VRB at times in the process. Saturday will open up with SE winds getting to near 10 kt by mid morning. Expect VFR through the period.

Doom

LOT WATCHES/WARNINGS/ADVISORIES

IL...None. IN...None. LM...Small Craft Advisory until 4 AM CDT Saturday for the IL and IN nearshore waters.

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