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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 34°N 117.85°W (Text-Only)
NWS Forecast for: Diamond Bar CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Last Update: 12:07 pm PDT Jun 29, 2026		Print

  • This
    Afternoon

    This Afternoon: Mostly sunny early, then becoming cloudy, with a high near 75. Southwest wind around 10 mph.

    High: 75 °F

    Becoming
    Cloudy

  • Tonight

    Tonight: Cloudy, with a low around 59. Southwest wind 5 to 10 mph becoming light south after midnight.

    Low: 59 °F

    Cloudy

  • Tuesday

    Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 75. Light south wind becoming southwest 5 to 10 mph in the afternoon.

    High: 75 °F

    Decreasing
    Clouds

  • Tuesday
    Night

    Tuesday Night: Cloudy, with a low around 56. Southwest wind 5 to 10 mph becoming light south southwest after midnight.

    Low: 56 °F

    Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 76 °F

    Mostly Sunny

  • Wednesday
    Night

    Wednesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Thursday
    Night

    Thursday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

    • This Afternoon: Mostly sunny early, then becoming cloudy, with a high near 75. Southwest wind around 10 mph.

    Tonight: Cloudy, with a low around 59. Southwest wind 5 to 10 mph becoming light south after midnight.

    Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 75. Light south wind becoming southwest 5 to 10 mph in the afternoon.

    Tuesday Night: Cloudy, with a low around 56. Southwest wind 5 to 10 mph becoming light south southwest after midnight.

    Wednesday: Mostly sunny, with a high near 76. Calm wind becoming southwest around 5 mph in the afternoon.

    Wednesday Night: Mostly cloudy, with a low around 55.

    Thursday: Mostly sunny, with a high near 79.

    Thursday Night: Mostly clear, with a low around 57.

    Friday: Mostly sunny, with a high near 81.

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

    Independence Day: Mostly sunny, with a high near 83.

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

    Sunday: Sunny, with a high near 84.


    Diamond Bar CA
     34°N 117.85°W (Elev. 679 ft)

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