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Ontario, CA Weather Forecast

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Ontario, CA Weather Forecast

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Ontario CA weather - Clear - 73°F
Clear
73°F
Updated 1:01 am
Feels Like 75°F
Humidity 64%
Wind N 0 mph
Barometer  29.92 in
Dew Point 60°F
Ontario CA weather - Clear - 23°C
Clear
23°C
Updated 1:01 am
Feels Like 24°C
Humidity 64%
Wind N 0 km/h
Barometer  101.3 kPa
Dew Point 16°C
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Ontario Weather Forecast

TODAY TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT
Ontario, CA Weather - Today Sunny Ontario, CA Weather - Tonight Partly Cloudy Ontario, CA Weather - Saturday Partly Cloudy Ontario, CA Weather - Saturday Night Partly Cloudy Ontario, CA Weather - Sunday Partly Cloudy Ontario, CA Weather - Sunday Night Chance Of Showers Ontario, CA Weather - Monday Chance Of Showers Ontario, CA Weather - Monday Night Chance Of Showers Ontario, CA Weather - Tuesday Mostly Sunny Ontario, CA Weather - Tuesday Night Mostly Clear Ontario, CA Weather - Wednesday Mostly Sunny Ontario, CA Weather - Wednesday Night Clear
Sunny Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Chance of Showers Chance of Showers Chance of Showers Mostly Sunny Mostly Clear Mostly Sunny Clear
Hi: 92°FHi: 33°C
 Lo: 65°FLo: 18°C Hi: 95°FHi: 35°C
 Lo: 66°FLo: 19°C Hi: 89°FHi: 32°C
 Lo: 59°FLo: 15°C Hi: 80°FHi: 27°C
 Lo: 59°FLo: 15°C Hi: 86°FHi: 30°C
 Lo: 61°FLo: 16°C Hi: 89°FHi: 32°C
 Lo: 62°FLo: 17°C
POP = Probability of Precipitation.
Weather Outlook Updated: 1142 PM PDT Fri Sep 25 2026 Ontario, CA Weather - WeatherWorld.com

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Ontario Forecast Discussion

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Issued: 1030 PM PDT Fri Sep 25 2026

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...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

...UPDATED AVIATION DISCUSSION...

Mid-level water vapor imagery shows a deep low over the PacNW and Hurricane Odalys strengthening to the southwest of Baja. Weak ridging remains over SoCal with drier air aloft, allowing temperatures to warm both today and tomorrow to around 5-8 degrees above normal. A trough off the backside of the larger low to the north w...