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

75°F

24°C

Humidity 25%
Wind Speed SW 8 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Last update 20 Apr 06:00 PM PDT
Extended Forecast for

Rancho Cucamonga CA

  • Tonight

    Tonight: Partly cloudy, with a low around 51. West wind 10 to 15 mph becoming light after midnight. Winds could gust as high as 20 mph.

    Low: 51 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers after 11am. Patchy fog before 11am. Otherwise, increasing clouds, with a high near 72. Light southwest wind increasing to 15 to 20 mph in the morning. Winds could gust as high as 30 mph. Chance of precipitation is 20%.

    High: 72 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: A chance of showers, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 49. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 49 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 70. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 70 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 49. West wind 10 to 15 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.

    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

  • Friday

    Friday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Friday Night

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

    Low: 53 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 51. West wind 10 to 15 mph becoming light after midnight. Winds could gust as high as 20 mph.
Tuesday
A slight chance of showers after 11am. Patchy fog before 11am. Otherwise, increasing clouds, with a high near 72. Light southwest wind increasing to 15 to 20 mph in the morning. Winds could gust as high as 30 mph. Chance of precipitation is 20%.
Tuesday Night
A chance of showers, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 49. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Mostly sunny, with a high near 70. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 49. West wind 10 to 15 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
Thursday
Sunny, with a high near 75.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 74.
Friday Night
Partly cloudy, with a low around 53.
Saturday
A slight chance of showers. Partly sunny, with a high near 67.
Saturday Night
Mostly cloudy, with a low around 51.
Sunday
Partly sunny, with a high near 68.
Sunday Night
Partly cloudy, with a low around 51.
Monday
Mostly sunny, with a high near 72.
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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:
11:30 am PDT Apr 20, 2026
Forecast Valid:
7pm PDT Apr 20, 2026-6pm PDT Apr 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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