Severe · Extreme Heat WarningActive alert

Extreme Heat Warning issued September 3 at 12:12AM CDT until September 5

Affecting Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City; Jefferson

In effect until: Sep 3, 2026, 8:15 PM

Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City; Jefferson

Likely impact; effects through 8:15 PM.

Stay in air conditioning if possible. Drink water regularly and check on elderly neighbors.

See it on the live map View official source

Read the original bulletin (official text)

* 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.

Free. In your language.

Get the next alert for your area before it matters.

Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Extreme Heat Warning issued September 3 at 12:12AM CDT until September 5

Get the next alert for your area before it matters.

Get alerts in your language