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.
Severe-weather outlook
The Storm Prediction Center has O'Fallon, MO in a Marginal Riskfor severe thunderstorms today (Day 1 categorical outlook).
3-day forecast
Today
Heavy drizzle
83° / 71°
39% precip
Tomorrow
Drizzle
90° / 71°
30% precip
Saturday
Thunderstorms
83° / 70°
59% precip
Forecast via Open-Meteo.
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.
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.