Extreme Heat Warning

Locations Affected

Saint Louis, MO ∙ Columbia, MO ∙ O'Fallon, MO ∙ Saint Charles, MO ∙ Saint Peters, MO ∙ Florissant, MO ∙ Lentner, MO ∙ Lima, IL ∙ Lewistown, MO ∙ Pittsfield Penstone Municipal Airport, IL

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service St Louis MO 1212 AM CDT Thu Sep 3 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT SATURDAY... * WHAT...Dangerously hot conditions with heat index values up to 110. * WHERE...In Illinois, 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 8 PM CDT Saturday. * 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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