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Chicagoland Braces for First Fall Frost; Favorable Weather Expected for Chicago Marathon Weekend

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Published on October 09, 2025
Chicagoland Braces for First Fall Frost; Favorable Weather Expected for Chicago Marathon WeekendSource: X/NWS Chicago

The Windy City is embracing its shift into the cooler, crisper fall season with the arrival of its first fall frost, anticipated to settle over parts of Chicagoland tonight. According to a forecast by FOX32 Chicago, a Frost Advisory is in place from 3 AM to 8 AM Thursday for several counties, including Lake, Porter, LaPorte, Newton, and Jasper Counties. Temperatures are expected to dip into the uncomfortable mid-30s to mid-40s range, with the advisory specifically cautioning of lows in Northwest Indiana.

Despite the chilly start on Thursday, temperatures will rise to create a more agreeable climate, with the thermometer reaching the low to mid-60s by the afternoon. "Increasing cloud cover is expected on Friday as a cold front approaches the area," according to FOX32 Chicago, which may result in stray showers during the day. Meanwhile, Friday's temperatures are poised to climb slightly warmer, peaking at the upper 60s in the afternoon.

Looking ahead at the weekend, Chicagoans can anticipate slightly cooler conditions with the National Weather Service forecasting sunny skies and highs in the mid-60s for Saturday, and partly cloudy skies on Sunday with temperatures nudging into the upper 60s. For runners and spectators alike, this spells out favorable weather for this weekend's Chicago Marathon. These details come from the National Weather Service, whose weekend outlook mirrors similar expectations.

The early week forecast sees a return to warmer weather. "Columbus Day Mostly sunny, with a high near 73," reports the National Weather Service, setting the stage for a pleasant holiday. This warm trend continues into the subsequent days with an anticipation of highs in the 70s under partly cloudy skies, from Monday through Wednesday. While there's a possibility for isolated showers within this timeframe, the chances appear to remain low, making for an overall agreeable week ahead in Chicago.