Ontario, CA — Severe Weather & Radar
No active severe-weather warnings for Ontario, CA right now. Live radar is below — set up alerts to get warned the moment one is issued.
One tap turns on push alerts for Tornado & Severe Thunderstorm Warnings that hit Ontario, CA — even when the app is closed. No account needed.
Severe-weather outlook
General (non-severe) thunderstorms are possible in Ontario, CAtoday, per the Storm Prediction Center's Day 1 outlook.
3-day forecast
Forecast via Open-Meteo.
When is severe weather most likely near Ontario?
Severe thunderstorms and tornadoes are relatively rare in Ontario.
The larger weather threats are winter storm systems bringing damaging winds, heavy rain, and flooding, mainly from late fall through spring.
Based on long-term NOAA / NWS Storm Prediction Center climatology.
In Ontario, CA
Ontario, CA is home to an estimated 170,000 people. Atmostorm shows whether Ontario 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 Ontario:
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.