St. Louis City and County hospitals have treated 46 heat-related illnesses since last Thursday.
A student at a southwest Illinois junior high school has died after suffering a medical emergency during a basketball practice.
St. Louis City Health Director Pam Walker is urging residents to protect themselves against the high temperatures and humidity.
The National Weather Service has issued a Heat Advisory over concerns about extreme heat and humidity.
National Weather Service says two new marks set on Friday.
Heat advisory through Saturday evening
Those needing help can call 2-1-1 from a landline phone.
The utility is asking customers to try and cool down their electric usage this weekend.
Heat index predicted to reach 100 each day for several more days
Heat waves of this length are uncommon in early June, say meteorologists.