O'Fallon, MO — Severe Weather & Radar
No active severe-weather warnings for O'Fallon, MO right now. Live radar is below — set up alerts to get warned the moment one is issued.
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Severe-weather outlook
General (non-severe) thunderstorms are possible in O'Fallon, MOtoday, per the Storm Prediction Center's Day 1 outlook.
3-day forecast
Forecast via Open-Meteo.
When is severe weather most likely near O'Fallon?
Around O'Fallon and the Midwest, severe weather is most active from April through June.
The main threats are damaging thunderstorm winds — including widespread, long-lived derechos — along with large hail and tornadoes.
Based on long-term NOAA / NWS Storm Prediction Center climatology.
In O'Fallon, MO
O'Fallon, MO is home to an estimated 83,000 people. Atmostorm shows whether O'Fallon is inside an active NWS warning polygon right now — and warns you the moment that changes.
Nearby areas
Live radar and active alerts for places near O'Fallon:
Not an official source — always confirm with the National Weather Service at weather.gov. Data aggregated from NWS/SPC. Facility and population figures are decision-support estimates.