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

Fontana-Arrow Highway (CQ057)

Lat: 34.10056°NLon: 117.49222°WElev: 1191.0ft.

NA

68°F

20°C

Humidity 39%
Wind Speed SE 0 MPH
Barometer NA
Dewpoint 42°F (6°C)
Visibility NA
Last update 07 Feb 08:00 PM PST
Extended Forecast for

Rancho Cucamonga CA

  • Tonight

    Tonight: Clear, with a low around 57. Calm wind becoming north around 5 mph after midnight.

    Low: 57 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 80. Calm wind becoming southwest around 5 mph.

    High: 80 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 56. Calm wind becoming north around 5 mph.

    Low: 56 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 78. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 54. West wind around 5 mph becoming calm.

    Low: 54 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: A slight chance of showers after 10am. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 66. Chance of precipitation is 20%.

    High: 66 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 50. Chance of precipitation is 40%.

    Low: 50 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers. Partly sunny, with a high near 66.

    High: 66 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers before 4am. Partly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 57. Calm wind becoming north around 5 mph after midnight.
Sunday
Sunny, with a high near 80. Calm wind becoming southwest around 5 mph.
Sunday Night
Mostly clear, with a low around 56. Calm wind becoming north around 5 mph.
Monday
Mostly sunny, with a high near 78. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Monday Night
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 54. West wind around 5 mph becoming calm.
Tuesday
A slight chance of showers after 10am. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 66. Chance of precipitation is 20%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 50. Chance of precipitation is 40%.
Wednesday
A slight chance of showers. Partly sunny, with a high near 66.
Wednesday Night
A slight chance of showers before 4am. Partly cloudy, with a low around 48.
Thursday
A slight chance of showers after 10am. Mostly sunny, with a high near 68.
Thursday Night
A slight chance of showers. Mostly clear, with a low around 46.
Friday
Sunny, with a high near 68.
Friday Night
Partly cloudy, with a low around 47.
Saturday
A chance of showers. Mostly sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rancho Cucamonga CA
 34.13°N 117.57°W (Elev. 1362 ft)
Last Update:
12:23 pm PST Feb 7, 2026
Forecast Valid:
9pm PST Feb 7, 2026-6pm PST Feb 14, 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