Extreme Heat Warning

Locations Affected

Saint Louis, MO ∙ O'Fallon, MO ∙ Saint Charles, MO ∙ Florissant, MO ∙ Saint Peters, MO ∙ Capitol Oaks, IL ∙ Dardenne Prairie, MO ∙ Valley Park, MO ∙ Oakland, MO ∙ Musicks Ferry, MO

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service St Louis MO 217 PM CDT Sat Jun 21 2025 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT TUESDAY... * WHAT...Dangerously hot conditions with heat index values up to 110. * WHERE...In Illinois, Jersey IL, Madison IL, Monroe IL, and Saint Clair IL Counties. In Missouri, Jefferson MO, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. * WHEN...Until 9 PM CDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668.

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