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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 34.1°N 117.43°W (Text-Only)
NWS Forecast for: Fontana CA
Issued by: National Weather Service San Diego, CA
Last Update: 8:38 pm PDT Jun 29, 2026		Print

  • Tonight

    Tonight: Patchy drizzle after 2am. Patchy fog before 2am. Otherwise, mostly cloudy, with a low around 57. West wind around 5 mph.

    Low: 57 °F

    Patchy
    Drizzle and
    Patchy Fog

  • Tuesday

    Tuesday: Patchy drizzle before 11am. Mostly cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 78 °F

    Patchy
    Drizzle then
    Sunny

  • Tuesday
    Night

    Tuesday Night: Increasing clouds, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 81. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 81 °F

    Patchy Fog
    then Sunny

  • Wednesday
    Night

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

    Low: 56 °F

    Clear


  • Thursday

    Thursday: Sunny, with a high near 83.

    High: 83 °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 86.

    High: 86 °F

    Sunny


  • Friday
    Night

    Friday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear


    • Tonight: Patchy drizzle after 2am. Patchy fog before 2am. Otherwise, mostly cloudy, with a low around 57. West wind around 5 mph.

    Tuesday: Patchy drizzle before 11am. Mostly cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    Tuesday Night: Increasing clouds, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Wednesday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 81. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

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

    Thursday: Sunny, with a high near 83.

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

    Friday: Sunny, with a high near 86.

    Friday Night: Mostly clear, with a low around 60.

    Independence Day: Mostly sunny, with a high near 89.

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

    Sunday: Sunny, with a high near 89.

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

    Monday: Sunny, with a high near 91.


    Fontana CA
     34.1°N 117.43°W (Elev. 1296 ft)

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