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

70°F

21°C

Humidity 74%
Wind Speed SSW 1 MPH
Barometer NA
Dewpoint 61°F (16°C)
Visibility NA
Last update 18 Jul 09:00 AM PDT
Extended Forecast for

Rancho Cucamonga CA

  • Today

    Today: A slight chance of showers and thunderstorms. Mostly cloudy, then gradually becoming sunny, with a high near 87. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 87 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 62. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 88. Southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61. Southwest wind 10 to 15 mph becoming light after midnight. Winds could gust as high as 20 mph.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 87. Light south wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers and thunderstorms. Mostly cloudy, then gradually becoming sunny, with a high near 87. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tonight
Mostly clear, with a low around 62. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 88. Southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Saturday Night
Mostly clear, with a low around 61. Southwest wind 10 to 15 mph becoming light after midnight. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 87. Light south wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Mostly clear, with a low around 61.
Monday
Sunny, with a high near 86.
Monday Night
Mostly clear, with a low around 59.
Tuesday
Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 59.
Wednesday
Sunny, with a high near 86.
Wednesday Night
Clear, with a low around 61.
Thursday
Sunny, with a high near 89.
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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:
8:27 am PDT Jul 18, 2025
Forecast Valid:
10am PDT Jul 18, 2025-6pm PDT Jul 24, 2025
 
Forecast Discussion
 
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Additional Resources

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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