Heat in Illinois

Events

2,049

Deaths

363

Injuries

423

Damage

$25,000

• Heat in Illinois, July 28 to 31, 199999 deaths · 7 eventsAn intense heat wave began in the Chicago metropolitan area July 28th and continued through the morning of July 31st. High temperatures on the 28th were in the lower to middle 90s with heat indices 100 to 105.
• Heat in Illinois, August 1 to 2, 200624 deaths · 1 eventThe second heat wave of the summer developed during late July 2006 and continued into early August. See Stormdata, July 2006, Illinois, Northeast. The high temperature at Northerly Island in downtown Chicago reached 99 on August 1st and 96 on August 2nd.
• Heat in Illinois, June 21 to 30, 199716 deaths · 1 eventFrom the period of June 21st through June 30th, temperatures were in the middle 80s to lower 90s, causing heat-related deaths throughout the Chicago area.
• Heat in Illinois, July 17 to 26, 201116 deaths · 1 eventThe Chicago area experienced an intense heat wave in mid to late July. High temperatures at Chicago O'Hare were 95 on the 17th, 92 on the 18th, 93 on the 19th, 99 on the 20th, and 99 on the 21st. Low temperatures were mostly in the 70s.
• Heat in Illinois, July 18 to 31, 19998 deaths · 119 injured · 17 eventsA heat wave gripped the region the last 2 weeks of July. Temperatures remained in the middle to upper 90s with a few days topping 100 degrees. The Heat Index ranged from 105 to near 115 degrees. Most of the deaths and injuries occurred in the Metro East area of St.
• Heat in Illinois, August 6 to 9, 200114 deaths · 1 eventThe high temperature climbed to 92 degrees at Ohare Airport on August 6th with a maximum heat index of 93 degrees. Heat indices arond the Chicago metro area were in the middle 90s.
• Heat in Illinois, July 21 to 25, 199913 deaths · 7 eventsA moderate heat wave began in the Chicago metropolitan area on July 21 and continued through July 25.
• Heat in Illinois, July 1 to 4, 200212 deaths · 1 eventJuly 2002 began well above normal with high temperatures in the lower to middle 90s across the Chicago area with overnight low temperatures mainly in the 70s. The prolonged heat and humidity which began in late June 2002, caused several heat related fatalities in Cook county.
• Heat in Illinois, July 15 to 22, 200211 deaths · 1 eventAn extended period of hot weather began on July 15th and continued through July 22nd. High temperatures ranged mainly from the upper 80s to middle 90s. July 21st was the hottest day when high temperatures reached the middle to upper 90s.
• Heat in Illinois, June 24 to 28, 199810 deaths · 1 eventDaytime temperatures were in the lower to middle 90s with dewpoints in the 70s on the 24th and 25th, producing heat indices of 102 to 107. Thunderstorms brought some relief from the heat on the 26th, though humidity was still high.
• Heat in Illinois, July 21 to 24, 200110 deaths · 1 eventAn excessive heat watch was issued on Friday, July 20th and an excessive heat warning was issued on Saturday, July 21st. The high temperature at Ohare Airport was 93 on both July 20th and 21st, 95 on July 22nd, 92 on July 23rd and 90 on July 24th.
• Heat in Illinois, July 15 to 17, 20069 deaths · 1 eventThe first heat wave of the summer developed in the middle of July. High temperatures at Northerly Island in downtown Chicago reached 92 on July 15th, 94 on July 16th and 95 on July 17th. The peak heat index reached 99 on July 15th, 104 on July 16th and 113 on July 17th.
• Heat in Illinois, June 23 to 30, 19981 death · 122 injured · 4 eventsThe first heat wave of the summer caused 1 death and over 120 heat related injuries. The bulk of the injuries in Madison County occurred at an NHRA drag racing event that was held at Gateway International Raceway June 25-28. The 1 death occurred in East St. Louis, St.
• Heat in Illinois, June 21 to 25, 20027 deaths · 1 eventSeven residents of Cook county died of heat related illinesses brought on by a prolonged period of hot weather. High temperatures at Chicago Ohare Airport ranged from the upper 80s to lower 90s with heat indices in the mid to upper 90s between June 21st and June 25th.
• Excessive Heat and Heat in Illinois, July 16 to 20, 20136 deaths · $25,000 · 3 eventsFrom July 14th through the 21st, temperatures climbed into the upper 80s to mid 90s while overnight lows stayed in the 70s. The warmest stretch ran from the 17th through the 19th.
• Heat in Illinois, July 29 to 31, 20016 deaths · 1 eventAn excessive heat watch was issued on Monday, July 30th and an excessive heat warning was issued on Wednesday, August 1st. The high temperature at Ohare Airport was 90 on both July 29th and July 30th and 94 degrees on July 31st.
• Heat in Illinois, August 5 to 7, 19965 deaths · 1 eventThree days of heat indices above 100 degrees, contributed to 4 deaths in Chicago and one in Elmwood Park. On the 5th the high temperature at O'Hare was 89 and Midway was 90 and the heat index was 100 at both locations.
• Heat in Illinois, July 14 to 18, 19975 deaths · 1 eventFrom July 14th through July 18th, temperatures were in the upper 80s and middle 90s (with heat indices reaching 100 degrees) causing heat-related deaths throughout the Chicago area.
• Heat in Illinois, July 20 to 26, 19994 deaths · 35 eventsThe excessive heat wave began on the 20th of July and continued for most of the area through the 26th. Temperatures were in the lower to middle 90s with heat index values in the 105 to 110 degree range each day.
• Heat in Illinois, July 18 to 31, 19994 deaths · 19 eventsProlonged heat and humidity during the latter half of July took its toll on the unprepared. Four fatalities were blamed on the heat, including two in Wayne County.
• Heat in Illinois, May 23 to 26, 20104 deaths · 2 eventsHigh temperatures reached the upper 80s to lower 90s from May 23rd to May 26th. Three people died of heat related illnesses in Will County and one person died from a heat related illiness in Cook County.
• Heat in Illinois, June 3 to 11, 19994 deaths · 1 eventA mild heat wave resulted in 4 deaths in Cook County. High temperatures were around 90 with the maximum heat index around 95 to 100 for about a week.
• Heat in Illinois, July 7 to 8, 20024 deaths · 1 eventAfter a brief cool down on July 5th and 6th, high temperatures reached the upper 80s and lower 90s on July 7th and 8th with low temperatures in the middle to upper 60s. This short hot spell was responsible for 4 fatalities in Cook county.
• Heat in Illinois, July 28 to 31, 20064 deaths · 1 eventThe second heat wave of the summer developed during the end of July and continued into early August. High temperatures at Northerly Island in downtown Chicago reached 88 on July 28th, 93 on July 29th, 90 on July 30th and 98 on July 31st.
• Heat in Illinois, August 1 to 3, 20114 deaths · 1 eventThe Chicago area saw high temperatures in the lower to middle 90s combined with low temperatures in the lower to middle 70s for the first few days of August. Four people in Cook County died due, in part, to the heat.

Heat everywhereEvery kind of event in Illinois

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.