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Ontario, CA Weather Forecast

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Ontario, CA Weather Forecast

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Ontario CA weather - Clear - 62°F
Clear
62°F
Updated 4:51 am
Feels Like 64°F
Humidity 88%
Wind N 0 mph
Barometer  30.07 in
Dew Point 59°F
Ontario CA weather - Clear - 17°C
Clear
17°C
Updated 4:51 am
Feels Like 18°C
Humidity 88%
Wind N 0 km/h
Barometer  101.8 kPa
Dew Point 15°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 Mostly Sunny Ontario, CA Weather - Tonight Mostly Clear Ontario, CA Weather - Saturday Mostly Sunny Ontario, CA Weather - Saturday Night Partly Cloudy Ontario, CA Weather - Sunday Partly Cloudy Ontario, CA Weather - Sunday Night Partly Cloudy Ontario, CA Weather - Monday Partly Cloudy Ontario, CA Weather - Monday Night Clear Ontario, CA Weather - Tuesday Partly Cloudy Ontario, CA Weather - Tuesday Night Clear Ontario, CA Weather - Wednesday Mostly Sunny Ontario, CA Weather - Wednesday Night Mostly Clear
Mostly Sunny Mostly Clear Mostly Sunny Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Clear Partly Cloudy Clear Mostly Sunny Mostly Clear
Hi: 84°FHi: 29°C
 Lo: 57°FLo: 14°C Hi: 88°FHi: 31°C
 Lo: 60°FLo: 16°C Hi: 87°FHi: 31°C
 Lo: 59°FLo: 15°C Hi: 82°FHi: 28°C
 Lo: 56°FLo: 13°C Hi: 87°FHi: 31°C
 Lo: 60°FLo: 16°C Hi: 93°FHi: 34°C
 Lo: 63°FLo: 17°C
POP = Probability of Precipitation.
Weather Outlook Updated: 1228 AM PDT Fri Sep 18 2026 Ontario, CA Weather - WeatherWorld.com

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Issued: 232 AM PDT Fri Sep 18 2026

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

...UPDATED AVIATION DISCUSSION...

.SHORT TERM (Today through Sunday)... Low pressure over California will weaken and move inland today with high pressure aloft moving inland across California on Saturday. A low pressure system will develop off the California coast on Sunday and move inland into California on Monday.

High temperatures will warm a few degrees ...