Ontario, CA Weather Forecast
San Bernardino County, California
Live radar, warnings and storm tracking for Ontario, with free alerts the moment it counts.
The next few hours
Taller, warmer bars mean heavier rain. Dotted means no reading for that hour.
Hour by hour
Sunrise and sunset
Next five days, scored 0 to 100The first day or two use the HRRR and NBM cloud layers. Later days only have total cloud, so treat them as a rough guide.
Know when sunset at this place will be worth a photo
We score every sunrise and sunset here from the cloud, haze and smoke forecast, and let you know when one is likely to light up. Sunrise the evening before, sunset a few hours ahead.
Seven-day outlook
Free alerts for Ontario
Every NWS warning, pushed to your phone, inbox or webhook the moment it is issued.
Ontario, CA at a glance
Ontario is home to about 182,457 people in San Bernardino County, across 50 square miles. It ranks 25th by population of 450 places in California with a forecast here. The nearest neighbour with its own forecast is Chino, 5 miles away.
- County
- San Bernardino County
- Population
- 182,457 2023 est.
- Land area
- 50 sq mi
- People per sq mi
- 3,650
- Forecast point
- 34.0376°N, 117.6044°W
How well can the network see Ontario?
The nearest Doppler radar is KSOX (Santa Ana Mountains, CA), to the S. Its lowest scan passes about 820 ft above Ontario. That is about as close as US radar coverage gets: low-level rotation and gust fronts over Ontario show up clearly. Ontario is closer to its radar than 90% of US cities.
The closest weather station is KONT (Ontario Intl). Close enough that its readings are the conditions in town.
Forecasts near Ontario
- Chino, CA5 mi
- Eastvale, CA5 mi
- Montclair, CA6 mi
- Upland, CA6 mi
- Rancho Cucamonga, CA7 mi
- Jurupa Valley, CA8 mi
- Norco, CA8 mi
- Claremont, CA9 mi
Elsewhere in California
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