The extreme heat sparked a medical emergency at a Junior ROTC event in Waukegan. Nine high school students were hospitalized for heat-related issues. No one was seriously hurt.
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9 treated for heat-related issues in Waukegan
Meanwhile, Chicago area beaches were packed with people trying to keep cool - despite being one day into the official start of fall.
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Sunday is expected to bring more heat with temperatures at 87 degrees by noon, hitting the lower 90s by the afternoon.
Organizers of the Chicago Half-Marathon & 5K, which will be held Sunday, are preparing for the heat with extra water, ice and misting stations.