Extreme Heat Warning Issued for St. Louis Region
The National Weather Service in St. Louis has issued an Extreme Heat Warning through August 12, 2026.
3 reports on this incident · first at Aug 19, 2026, 9:54 p.m. ET
Earlier reports
Aug 19, 2026, 10:11 p.m. ET
NWS St. Louis Warns Heat-Related Illnesses Peak Days After Maximum Temperatures
The National Weather Service office in St. Louis noted in its excessive heat guidance that heat impacts are cumulative over time, with the greatest number of heat-induced illnesses and fatalities usually peaking two days after the maximum heat index values occur, Medical Daily reported.
The guidance comes as part of an Extreme Heat Warning issued for the St. Louis region that began on August 9, 2026, at 00:00:00 and expires on August 12, 2026, at 20:00:00. Under the warning, heat index values reached roughly 105 degrees on Sunday, August 9, 2026, and were forecast to approach 110 degrees on Monday, August 10, 2026, with high air temperatures in the mid-90s.
Aug 19, 2026, 9:54 p.m. ETFirst report
Extreme Heat Warning Issued for St. Louis Region
In a developing situation, an Extreme Heat Warning has been issued for the St. Louis region by the National Weather Service in St. Louis, Medical Daily reported. The warning began on August 9, 2026, at 00:00:00 and is set to expire on August 12, 2026, at 20:00:00.
According to Medical Daily, heat index values reached roughly 105 degrees on Sunday and were forecast to approach 110 on Monday, with high air temperatures in the mid-90s. The alert level for the hazard is classified as a warning.
Medical Daily reported that the National Weather Service office in St. Louis noted in its excessive heat guidance that the impacts of heat are cumulative over time, and the greatest number of heat-induced illnesses and fatalities usually peaks two days after the maximum heat index values occur.
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- Version 120 Aug 2026, 02:11current
First published.
- Version 120 Aug 2026, 01:54current
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- Version 120 Aug 2026, 02:24current
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