Heat Advisory

Locations Affected

Saint Louis, MO ∙ Columbia, MO ∙ O'Fallon, MO ∙ Saint Charles, MO ∙ Florissant, MO ∙ Saint Peters, MO ∙ High Ridge, MO ∙ Oak Hills, IL ∙ Horine, MO ∙ Knob Lick, MO

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service St Louis MO 113 AM CDT Tue Jun 9 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 10 PM CDT THIS EVENING... * WHAT...Heat index values up to 108 expected. * WHERE...Portions of southwest Illinois and central, east central, and southeast Missouri. * WHEN...From noon today to 10 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

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