National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Ontario International Airport (KONT)

Lat: 34.05316°NLon: 117.57685°WElev: 906.0ft.

Rain

60°F

16°C

Humidity 92%
Wind Speed N 0 MPH
Barometer 30.06 in (1017.95 mb)
Dewpoint 58°F (14°C)
Visibility 7.00 mi
Last update 02 Jan 10:39 PM PST
Extended Forecast for

Rancho Cucamonga CA

  • Tonight

    Tonight: A chance of showers, mainly before 4am. Cloudy, with a low around 54. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 54 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers, mainly after 10am. The rain could be heavy at times. High near 63. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Heavy Rain

  • Saturday Night

    Saturday Night: Showers, mainly before 10pm. The rain could be heavy at times. Low around 52. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 52 °F

    Heavy Rain
    then Chance
    Showers

  • Sunday

    Sunday: Showers likely. Mostly cloudy, with a high near 61. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 61 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 49. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 49 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers, mainly before 10am. Partly sunny, with a high near 60. Chance of precipitation is 30%.

    High: 60 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, mainly after 10pm. Mostly cloudy, with a low around 47. Chance of precipitation is 30%.

    Low: 47 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers. Partly sunny, with a high near 61.

    High: 61 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Partly cloudy, with a low around 45.

    Low: 45 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
A chance of showers, mainly before 4am. Cloudy, with a low around 54. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Showers, mainly after 10am. The rain could be heavy at times. High near 63. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Showers, mainly before 10pm. The rain could be heavy at times. Low around 52. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Showers likely. Mostly cloudy, with a high near 61. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Showers likely, mainly before 10pm. Mostly cloudy, with a low around 49. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Monday
A chance of showers, mainly before 10am. Partly sunny, with a high near 60. Chance of precipitation is 30%.
Monday Night
A chance of showers, mainly after 10pm. Mostly cloudy, with a low around 47. Chance of precipitation is 30%.
Tuesday
A chance of showers. Partly sunny, with a high near 61.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 45.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 61.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 43.
Thursday
A slight chance of showers. Mostly sunny, with a high near 60.
Thursday Night
Mostly clear, with a low around 42.
Friday
Sunny, with a high near 61.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rancho Cucamonga CA
 34.1°N 117.57°W (Elev. 1198 ft)
Last Update:
12:55 pm PST Jan 2, 2026
Forecast Valid:
10pm PST Jan 2, 2026-6pm PST Jan 9, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation