St. Louis

St. Louis Metro Area Under Extreme Heat Warning, Heat Index to Reach 110

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Published on June 21, 2025
St. Louis Metro Area Under Extreme Heat Warning, Heat Index to Reach 110Source: Google Street View

The National Weather Service St. Louis, MO, has issued an Extreme Heat Warning for areas including Jersey IL, Madison IL, Monroe IL, Saint Clair IL, Jefferson MO, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. This warning is in effect from noon today to 9 p.m. CDT Tuesday due to "dangerously hot conditions with heat index values up to 110 expected," as detailed by the NWS.

Residents within St. Louis Metropolitan Area are urged to prepare for the scorching temperatures that could have detrimental impacts on health. The warning advises that "heat related illnesses increase during extreme heat and high humidity events." To potentially provide relief, people can seek information about cooling centers or energy assistance by calling the United Way of Greater Saint Louis at 800-427-4626, or by calling Cool Down Saint Louis at 314-241-7668, especially if they find themselves in need to quickly find refuge from the sweltering conditions, as per the NWS.

Alongside the Extreme Heat Warning, there's also a Heat Advisory that is in effect areawide from noon today through 9 p.m. Tuesday, as reported by the National Weather Service. This advisory covers a broader region, stressing the widespread nature of the heat event.

Looking ahead, the oppressively hot weather looks set to continue with sunny and hot conditions predicted for the following days. The heat index is expected to again climb up to 105 on Sunday. With little respite at night, lows will hover around the mid-70s throughout the week. By Tuesday, there is a slight chance of showers and thunderstorms which might offer a brief break to the inhabitants of these regions attempting to grapple with the relentless heat.