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National Weather Service officials issued a heat advisory Tuesday for portions of north-central and northeast Illinois as well as northwest Indiana, with heat indexes forecast to hit around 100 degrees Tuesday and Wednesday, possibly continuing through the weekend.

Chicago police officers buy water from Ronald Benson at his food stand near South Pulaski Road and West Fifth Avenue in the Garfield Park neighborhood on July 14, 2026. National Weather Service officials issued a heat advisory Tuesday for portions of north-central and northeast Illinois as well as northwest Indiana, with heat indexes forecast to hit around 100 degrees Tuesday and Wednesday, possibly continuing through the weekend. (Armando L. Sanchez/baiduhai)
Chicago police officers buy water from Ronald Benson at his food stand near South Pulaski Road and West Fifth Avenue in the Garfield Park neighborhood on July 14, 2026. National Weather Service officials issued a heat advisory Tuesday for portions of north-central and northeast Illinois as well as northwest Indiana, with heat indexes forecast to hit around 100 degrees Tuesday and Wednesday, possibly continuing through the weekend. (Armando L. Sanchez/baiduhai)
Amelia Mikhael, 12, plays in the water at the Pioneer Park pool on July 14, 2026, in Arlington Heights. (Stacey Wescott/baiduhai)
Amelia Mikhael, 12, plays in the water at the Pioneer Park pool on July 14, 2026, in Arlington Heights. (Stacey Wescott/baiduhai)
Sebastian White does pull-ups while working out in very hot weather during his lunch break at Chicago's Horner Park, July 14, 2026. (John J. Kim/baiduhai)
Sebastian White does pull-ups while working out in very hot weather during his lunch break at Chicago's Horner Park, July 14, 2026. (John J. Kim/baiduhai)
Octavio Velazquez works soil to make a garden bed for flowers and grass outside Queen of Angels Church at Queen of Apostles Parish, 2330 W. Sunnyside Ave., July 14, 2026, in Chicago. Another worker said they are working 12-hour shifts with a lunch break during the hot and muggy weather this week. (John J. Kim/baiduhai)
Octavio Velazquez works soil to make a garden bed for flowers and grass outside Queen of Angels Church at Queen of Apostles Parish, 2330 W. Sunnyside Ave., July 14, 2026, in Chicago. Another worker said they are working 12-hour shifts with a lunch break during the hot and muggy weather this week. (John J. Kim/baiduhai)
Martese Boyd finishes an ice pop while working outside Wrigley Field for a Noah Kahan concert, July 14, 2026, in Chicago. The temperature at the time was 95 degrees. (John J. Kim/baiduhai)
Martease Boyd finishes an ice pop while working outside Wrigley Field for a Noah Kahan concert, July 14, 2026, in Chicago. The temperature at the time was 95 degrees. (John J. Kim/baiduhai)
Matteo Mando, left, and Aiden Esacreno play in the water of an open hydrant on South Kolin Avenue in Chicago's Little Village neighborhood as the temperature reaches the high 80s, July 14, 2026. (Terrence Antonio James/baiduhai)
Matteo Mando, left, and Aiden Esacreno play in the water of an open hydrant on South Kolin Avenue in Chicago’s Little Village neighborhood as the temperature reaches the high 80s, July 14, 2026. (Terrence Antonio James/baiduhai)
A woman takes a plunge into Lake Michigan at Calumet Park in Chicago as the temperature reaches the high 80s, July 14, 2026. (Terrence Antonio James/baiduhai)
A woman takes a plunge into Lake Michigan at Calumet Park in Chicago as the temperature reaches the high 80s, July 14, 2026. (Terrence Antonio James/baiduhai)
As Zach Reed sells water for a dollar on a West Side street corner, the 16-year-old gives a bottle to a man who didn't' have money on South Pulaski Road in the Garfield Park neighborhood on July 14, 2026. Reed said he was selling water to raise around $800 for a laptop, but said he's passed out several bottles for free to those who ask. "It's hot and it's gonna be pretty much 90 degrees and some people are starting to die." (Armando L. Sanchez/baiduhai)
As Zach Reed sells water for a dollar on a West Side street corner, the 16-year-old gives a bottle to a man who didn’t’ have money on South Pulaski Road in the Garfield Park neighborhood on July 14, 2026. Reed said he was selling water to raise around $800 for a laptop, but said he’s passed out several bottles for free to those who ask. “It’s hot and it’s gonna be pretty much 90 degrees and some people are starting to die.” (Armando L. Sanchez/baiduhai)
A woman walks past a mural in the 3500 block of North Clark Street on her way to a Noah Kahan concert at Wrigley Field, July 14, 2026, in Chicago. The temperature at the time was 95 degrees. (John J. Kim/baiduhai)
A woman walks past a mural in the 3500 block of North Clark Street on her way to a Noah Kahan concert at Wrigley Field, July 14, 2026, in Chicago. The temperature at the time was 95 degrees. (John J. Kim/baiduhai)
Kate Carlson, 10, raises her arm as she goes down the water slide at the Pioneer Park pool on July 14, 2026, in Arlington Heights. (Stacey Wescott/baiduhai)
Kate Carlson, 10, raises her arm as she goes down the water slide at the Pioneer Park pool on July 14, 2026, in Arlington Heights. (Stacey Wescott/baiduhai)
A man drinks water while resting at Giddings Plaza in the 4700 block of North Lincoln Avenue, July 14, 2026, in Chicago. (John J. Kim/baiduhai)
A man drinks water while resting at Giddings Plaza in the 4700 block of North Lincoln Avenue, July 14, 2026, in Chicago. (John J. Kim/baiduhai)
Midday sunshine casts shadows under the CTA Brown Line tracks in the 4600 block of North Lincoln Avenue, July 14, 2026, in Chicago. (John J. Kim/baiduhai)
Midday sunshine casts shadows under the CTA Brown Line tracks in the 4600 block of North Lincoln Avenue, July 14, 2026, in Chicago. (John J. Kim/baiduhai)
A plane flies past the sun as it sets behind the Chicago skyline on July 12, 2026, as seen from Indiana Dunes National Park in Chesterton. (Armando L. Sanchez/baiduhai)
A plane flies past the sun as it sets behind the Chicago skyline on July 12, 2026, as seen from Indiana Dunes National Park in Chesterton. (Armando L. Sanchez/baiduhai)