Extreme Heat Warning in Effect for Missouri and Illinois Through Wednesday
Extreme Heat Warning in Effect for Missouri and Illinois Through Wednesday
US · Published Aug 31, 2026
The National Weather Service in St. Louis, MO, has issued an Extreme Heat Warning and Heat Advisory for portions of Missouri and southwest Illinois. Heat index values are forecast to reach between 100°F and 110°F (37.8°C to 43.3°C) each afternoon through Wednesday, August 13,
The most affected areas are between the I-70 and I-44 corridors. Forecaster confidence is high regarding the dangerous heat's impact, though the exact extent of the affected regions remains uncertain. The warning is set to expire at 8 PM Wednesday.

Impact & Risks

The extreme heat poses significant health risks, particularly for vulnerable populations such as the elderly, children, and those with pre-existing health conditions. Prolonged exposure to high temperatures can lead to heat-related illnesses, including heat exhaustion and heat stroke. Outdoor workers and individuals without access to air conditioning are at heightened risk. Residents in areas under the Extreme Heat Warning should take immediate precautions to avoid heat-related health issues.

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