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Nearing record warmth; 80° heat not done yet!
The National Weather Service said 85-degree readings at O'Hare and 87 in Rockford set new daily records before showers and a sharp cooldown arrive.
Chicago set a new temperature record on Monday as O'Hare International Airport hit 85 degrees, breaking the daily record of 84 degrees that had stood since 2008, the National Weather Service said.
A warm air mass from the south moved over the upper Midwest during the holiday weekend, with NWS meteorologist Jake Petr noting conditions were 'typical mid-July' for unseasonable October warmth.
Tuesday remains warm with expected highs near 81 degrees, though meteorologists explained the humidity and summer-like feel will persist only briefly before the incoming system shifts the pattern.
Showers and thunderstorms will arrive Tuesday night as a cold front moves through Wednesday, causing temperatures to plummet into the 60s and bringing what officials called 'typical mid-October' weather.
By Friday, highs will struggle to reach the upper 50s, with Saturday morning lows in the 30s potentially bringing the season's first frost before temperatures rebound into the 70s next week.