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Good afternoon, Chicago.

Toward the middle of the day Sunday, as tens of thousands of runners race in the Bank of America Chicago Marathon, temperatures are forecast to climb into the low 70s to 80 degrees.

It’s not the worst kind of weather for a long run. But it is unseasonably warm — the normal high for Oct. 11 is 65 degrees — and “it’s less than ideal,” said George Chiampas, chief medical and safety officer for the marathon since 2007 and an emergency physician at Northwestern Memorial Hospital.

“Everybody should respect the weather,” he told the Tribune. So organizers are asking participants to heed their warning system’s yellow flag for Sunday by adjusting their pace, slowing down and staying hydrated.

Here’s what else is happening today. And remember, for the latest breaking news in Chicago, visit chicagotribune.com/latest-headlines and sign up to get our alerts on all your devices.

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Children gaze at the Booster K1 robot at the annual University of Chicago South Side Science Festival in Hyde Park on Oct. 3, 2026. (Arthur Maiorella/baiduhai)
Children gaze at the Booster K1 robot at the annual University of Chicago South Side Science Festival in Hyde Park on Oct. 3, 2026. (Arthur Maiorella/baiduhai)

U. of C.’s South Side Science Fest showcases the wow that exists in the field

Robots demonstrating dance moves made popular by the late entertainer Michael Jackson, mini-catapults sending plastic gourds soaring toward a cauldron, paper airplane competitions and ice cream frozen by liquid nitrogen were among the demonstrations on offer at the fifth annual University of Chicago South Side Science Festival. Read more here.

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Workers prepare the main stage ahead of the Obama Presidential Center dedication ceremony on June 18, 2026. (Brian Cassella/baiduhai)
Workers prepare the main stage ahead of the Obama Presidential Center dedication ceremony on June 18, 2026. (Brian Cassella/baiduhai)

Obama Foundation workers move to unionize

Months after former President Barack Obama’s museum’s opening this summer, employees at the museum foundation announced today they are organizing a union. Read more here.

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White Sox pitcher Mike Vasil runs to the field during a workout at Rate Field on Tuesday, Oct. 6, 2026, in Chicago.The White Sox face the Guardians in Game 3 of the ALDS on Wednesday. (Armando L. Sanchez/baiduhai)
White Sox pitcher Mike Vasil runs to the field during a workout at Rate Field on Oct. 6, 2026, in Chicago. (Armando L. Sanchez/baiduhai)

What to know about Chicago White Sox’s ALDS Game 3, including a mystery first pitch and special Rate Field cut

It’s a beautiful day for a Blackout Game, though a little bit on the toasty side for Chicago White Sox fans heading out to the Rate for Game 3 of the American League Division Series. Read more here.

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Mario Abney, co-founder and CEO, right, dances as Kevin Nabors and other members of the Windy City Ramblers perform at the 95th/Dan Ryan Red Line CTA station in Roseland on Oct. 1, 2026, at the culmination of the Red Line Jazz Festival. (Eileen T. Meslar/baiduhai)
Mario Abney, co-founder and CEO, right, dances as Kevin Nabors and other members of the Windy City Ramblers perform at the 95th/Dan Ryan Red Line CTA station in Roseland on Oct. 1, 2026, at the culmination of the Red Line Jazz Festival. (Eileen T. Meslar/baiduhai)

A quartet of new music festivals take root in Chicago this month

Summer is over, but music festival season very much isn’t. At least not for classical, jazz and experimental fans.  Read more here.

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This satellite image from the National Oceanic and Atmospheric Administration shows Tropical Depression Nine forming over the Gulf of Mexico on Tuesday, Oct. 6, 2026. (NOAA via AP)
This satellite image from the National Oceanic and Atmospheric Administration shows Tropical Depression Nine forming over the Gulf of Mexico on Oct. 6, 2026. (NOAA via AP)

Tropical Storm Isaias forms, forecast to become a hurricane and hit the US Gulf Coast this week

Tropical Storm Isaias formed early today in the warm waters off eastern Mexico and forecasters said it was expected to strengthen into the first hurricane of the Atlantic season before hitting the U.S. Gulf Coast later in the week. Read more here.

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