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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 34.1°N 117.57°W (Text-Only)
NWS Forecast for: Rancho Cucamonga CA
Issued by: National Weather Service San Diego, CA
Last Update: 2:23 am PDT Jun 30, 2026		Print

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 77. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 77 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 56. Southwest wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph.

    Low: 56 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 79. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 79 °F

    Patchy Fog
    then Sunny

  • Wednesday
    Night

    Wednesday Night: Mostly clear, with a low around 56. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.

    Low: 56 °F

    Mostly Clear


  • Thursday

    Thursday: Sunny, with a high near 82. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 82 °F

    Sunny


  • Thursday
    Night

    Thursday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear


  • Friday

    Friday: Sunny, with a high near 85.

    High: 85 °F

    Sunny


  • Friday
    Night

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

    Low: 59 °F

    Mostly Clear


  • Independence
    Day

    Independence Day: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny


    • Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 77. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    Tonight: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 56. Southwest wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph.

    Wednesday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 79. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    Wednesday Night: Mostly clear, with a low around 56. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.

    Thursday: Sunny, with a high near 82. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    Thursday Night: Mostly clear, with a low around 58.

    Friday: Sunny, with a high near 85.

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

    Independence Day: Mostly sunny, with a high near 88.

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

    Sunday: Sunny, with a high near 88.

    Sunday Night: Mostly clear, with a low around 62.

    Monday: Sunny, with a high near 90.


    Rancho Cucamonga CA
     34.1°N 117.57°W (Elev. 1198 ft)

    Visit your local NWS office at: https://www.weather.gov/sgx