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

76°F

24°C

Humidity 29%
Wind Speed WSW 7 MPH
Barometer NA
Dewpoint 42°F (6°C)
Visibility NA
Heat Index77°F (25°C)
Last update 19 Apr 07:00 PM PDT
Extended Forecast for

Rancho Cucamonga CA

  • Tonight

    Tonight: Mostly clear, with a low around 53. West wind 5 to 10 mph becoming light southwest after midnight.

    Low: 53 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 77. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 20 mph.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51. West wind 10 to 15 mph becoming light southwest after midnight. Winds could gust as high as 20 mph.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers after 11am. Mostly sunny, with a high near 70. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 70 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 50. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 50 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 53. West wind 5 to 10 mph becoming light southwest after midnight.
Monday
Sunny, with a high near 77. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 20 mph.
Monday Night
Mostly clear, with a low around 51. West wind 10 to 15 mph becoming light southwest after midnight. Winds could gust as high as 20 mph.
Tuesday
A chance of showers after 11am. Mostly sunny, with a high near 70. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 50. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 68.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 75.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 75.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Partly sunny, with a high near 71.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rancho Cucamonga CA
 34.13°N 117.57°W (Elev. 1362 ft)
Last Update:
11:27 am PDT Apr 19, 2026
Forecast Valid:
8pm PDT Apr 19, 2026-6pm PDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation