National Weather Service United States Department of Commerce


A strong upper level ridge of high pressure built into the lower Ohio Valley on the 4th of July and remained in place until a cold front provided relief from the heat late on July 8th. The most oppressive days were July 5 and 6. High temperatures in the mid 90s to around 100 combined with extremely high dewpoints ranging from 75 to 80 to produce heat index readings above 110 in most locations, and localized readings up to around 120 were observed. Some areas saw relief from the heat on July 7th, especially portions of southern Illinois and southwest Indiana. Additional relief in the form of scattered showers and thunderstorms occurred on the 8th. Paducah's heat index of 114 on July 5 was their highest heat index since August 3, 2011. Paducah also managed to reach a peak heat index of 110 on 4 straight days from July 5-8. This was the first time Paducah observed 4 straight days exceeding a 110 degree heat index since July 31 - August 3, 1987. Triple digit temperatures were also experienced for some areas. In Evansville, this was the first time since 2012 that high temperatures reached 100 degrees. For Paducah, it was the first time since 2016 reaching 100.

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