An excessive heat warning remains in effect until Thursday evening.
The National Weather Service in Paducah issued the warning for all of southeast Missouri, southern Illinois, southwest Indiana and western Kentucky.
Temperatures through Thursday are expected to reach around 105 degrees during the afternoon.
The Occupational Safety and Health Administration is recommending that individuals who work outdoors to take frequent breaks in shaded or air conditioned environments.
Anyone who appears to be overcome by the heat should be moved to a cool and shaded area and to contact 9-1-1.