Ontario, California Weather
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Weather Forecast for Ontario, California : San Bernardino County
Issued: 1:00 pm PDT Sep 15, 2025 Latitude: 34.0633443 Longitude: -117.6508876 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Tuesday Wednesday Thursday Friday Saturday Sunday
Sunny on This Afternoon Mostly Clear on Tonight Sunny on Tuesday Mostly Sunny on Wednesday 60% chance of thunderstorms on Thursday 10% chance of thunderstorms on Friday Sunny on Saturday Sunny on Sunday
High: 94°F Low: 68°F High: 96°F High: 92°F High: 86°F High: 87°F High: 89°F High: 90°F
Low: 69°F Low: 69°F Low: 67°F Low: 67°F Low: 67°F  
Sunny Mostly Clear Sunny Mostly Sunny Thunderstorms Thunderstorms Sunny Sunny
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Current Conditions at
ONTARIO - (KONT)
90°
Clear
as of 12:53 PM PDST
Rel. Humidity: 31%
Dew Point: 55°F
Visibility: 10 Miles
Pressure: 29.88 in.
Flight Rule: VFR
Wind Data
5 MPH
Cloud Level(s): Clear
Current Conditions at
CHINO - (KCNO)
91°
Clear
as of 12:53 PM PDST
Rel. Humidity: 31%
Dew Point: 57°F
Visibility: 10 Miles
Pressure: 29.88 in.
Flight Rule: VFR
Wind Data
5 MPH
280° West
Cloud Level(s): Clear
Current Conditions at
RIVERSIDE - (KRAL)
90°
Clear
as of 12:53 PM PDST
Rel. Humidity: 31%
Dew Point: 55°F
Visibility: 10 Miles
Pressure: 29.87 in.
Flight Rule: VFR
Wind Data
10 MPH
260° West
Cloud Level(s): Clear
Current Conditions at
FULLERTON - (KFUL)
86°
Clear
as of 12:53 PM PDST
Rel. Humidity: 45%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 29.86 in.
Flight Rule: VFR
Wind Data
5 MPH
Cloud Level(s): Clear
Sunny on This Afternoon This Afternoon... Sunny, with a high near 94. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 68. West wind 5 to 10 mph becoming light and variable after midnight.
Sunny on Tuesday Tuesday... Sunny, with a high near 96. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 69. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 92. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
30% chance of thunderstorms Wednesday Night Wednesday Night... A chance of showers and thunderstorms, mainly after 11pm. Mostly cloudy, with a low around 69. Chance of precipitation is 30%.
60% chance of thunderstorms Thursday Thursday... Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.
10% chance of thunderstorms Thursday Night Thursday Night... A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67.
10% chance of thunderstorms Friday Friday... A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 67.
Sunny on Saturday Saturday... Sunny, with a high near 89.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 67.
Sunny on Sunday Sunday... Sunny, with a high near 90.
Current Radar Image


Sun Almanac for Ontario, California
Sunrise: 06:34 AM
Sunset: 6:57 PM
Civil Sunrise:06:09 AM
Civil Sunset: 7:22 PM
Nautical Sunrise: 05:40 AM
Nautical Sunset: 7:51 PM
Astro Sunrise: 05:10 AM
Astro Sunset: 8:21 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.