High temperatures reached the middle to upper 90s on August 23rd.  Dewpoints were in the upper 70s to lower 80s producing heat index values in the 115 to 120 degree range during the afternoon.  Chicago O'Hare Airport set a new daily record high of 98 degrees on August 23rd and also measured a dewpoint of 80 degrees.  This was only the seventh calendar day since records began that Chicago measured a dewpoint of 80 degrees.  Rockford Airport reached 97 degrees wtih a peak heat index of 116 degrees, neither were new records.
High temperatures ranged from the middle 90s to 100 degrees on August 24th.  Dewpoints were again in the upper 70s to lower 80s producing heat index values in the 115 to 120 degree range during the afternoon. Chicago O'Hare Airport tied their daily record high of 100 degrees.  The highest measured dewpoint was 79 degrees.  The peak heat index value was 120 degrees, which is the highest measured heat index value in Chicago since records began.  Rockford Airport reached 97 degrees wtih a peak heat index of 118 degrees, neither were new records.

Excessive Heat in CENTRAL COOK COUNTY, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in NORTHERN COOK COUNTY, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in SOUTHERN COOK COUNTY, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in DU PAGE, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in LAKE, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in MCHENRY, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in KANE, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in DE KALB, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in BOONE, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in WINNEBAGO, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in OGLE, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in LEE, ILLINOIS
From 23-AUG-23 10:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in LA SALLE, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in KENDALL, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Excessive Heat in GRUNDY, ILLINOIS
From 23-AUG-23 10:00:00 to 23-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in NORTHERN WILL COUNTY, ILLINOIS
From 23-AUG-23 09:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in SOUTHERN WILL COUNTY, ILLINOIS
From 23-AUG-23 10:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in EASTERN WILL COUNTY, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in LIVINGSTON, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in IROQUOIS, ILLINOIS
From 23-AUG-23 12:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in FORD, ILLINOIS
From 23-AUG-23 11:00:00 to 24-AUG-23 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Excessive Heat in KANKAKEE, ILLINOIS
From 23-AUG-23 12:00:00 to 24-AUG-23 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS