Midwest heat smashes October records from Chicago to Minnesota
Chicago hit 87°F on Oct. 12, breaking a 2008 daily record, while the Twin Cities posted back-to-back 90°F October days for the first time in 154 years of records. Milwaukee, Omaha and St. Cloud also set or tied late-season heat marks before a cold front.
AI-assisted · US Brief desk · Sources listed below
What happened
A late-season heat dome pushed summer-like temperatures across the Upper Midwest over the Columbus Day / Indigenous Peoples' Day weekend. Chicago's official high at O'Hare reached 87°F on Oct. 12, two degrees above the prior Oct. 12 record of 85°F set in 2008, CBS News Chicago reported. Milwaukee hit a record 85°F the same day, per the Milwaukee Journal Sentinel.
Why it matters
Back-to-back October 90s and another round of "latest 90" records extend a run of unusually late heat that Minnesota climatologists say also marked 2023 and 2025 — and they note those prior latest-90 records keep getting broken.
What’s next
CBS Chicago said warmth lingered into Tuesday before overnight lows could fall into the upper 30s by week's end as a cold front arrives.
More context
By the numbers in Minnesota: The Minnesota DNR State Climatology Office said the Twin Cities recorded 90°F on both Oct. 10 and Oct. 11 — tying the Oct. 10 record from 1928, then demolishing the Oct. 11 mark of 85°F from 2015. It was the first year in 154 years of Twin Cities records with two October 90°F days. St. Cloud hit 90°F on Oct. 10, breaking both the daily record and the latest-date-to-reach-90°F mark (set only last year at 91°F on Oct. 4).
Elsewhere: WOWT reported Omaha logged four consecutive October days at or above 90°F, including 91°F on Oct. 12. Strong southerly winds ahead of a low-pressure system over the Dakotas steered the warm air north, the Minnesota climatology office said.
4 listed sources
- CBS News Chicago, Oct. 12, 2026
- Minnesota DNR State Climatology Office, Oct. 12, 2026
- Milwaukee Journal Sentinel, Oct. 12, 2026
- WOWT, Oct. 12, 2026
References listed by US Brief; a source count is not a verification score.
Editorial sourcing notes
Chicago O'Hare high and prior record from CBS News Chicago, Oct. 12. Minnesota Twin Cities and St. Cloud records from the Minnesota DNR State Climatology Office journal entry dated Oct. 12. Milwaukee and Omaha figures from local reports (Milwaukee Journal Sentinel; WOWT). Forecast cool-down from CBS Chicago.
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