Extreme Heat Warning

Locations Affected

Saint Louis, MO ∙ Columbia, MO ∙ O'Fallon, MO ∙ Saint Charles, MO ∙ Saint Peters, MO ∙ Florissant, MO ∙ Fort Bellefontaine, MO ∙ Taos, MO ∙ Sauget, IL ∙ Danville, MO

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service St Louis MO 256 AM CDT Sat Jul 19 2025 ...EXTREME HEAT WARNING NOW IN EFFECT FROM NOON TODAY TO 7 PM CDT THURSDAY... * WHAT...Dangerously hot conditions with afternoon heat index values up to 110 expected for several consecutive days, and morning low temperatures in the mid to upper 70s. * WHERE...Portions of southwest Illinois and central, east central, and southeast Missouri. * WHEN...From noon today to 7 PM CDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...The long duration of this event is likely to worsen heat related impacts, and additional extensions may be needed beyond Thursday as forecast confidence increases. 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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