National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

WHITTIER HILLS (WTHC1)

Lat: 33.984°NLon: 118.00943°WElev: 950.0ft.

NA

71°F

22°C

Humidity 45%
Wind Speed ENE 9 MPH
Barometer NA
Dewpoint 49°F (9°C)
Visibility NA
Last update 11 Nov 12:57 AM PST
Extended Forecast for

Diamond Bar CA

  • Overnight

    Overnight: Clear, with a low around 64. East wind around 10 mph.

    Low: 64 °F

    Clear

  • Veterans Day

    Veterans Day: Sunny, with a high near 84. East wind around 5 mph becoming west in the afternoon.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 63. South southwest wind around 5 mph becoming east northeast after midnight.

    Low: 63 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 79. East northeast wind around 5 mph becoming calm in the morning.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: Rain likely, mainly after 4am. Mostly cloudy, with a low around 63. Calm wind becoming south around 5 mph in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 63 °F

    Chance Rain
    then Rain
    Likely

  • Friday

    Friday: Rain likely before 10am, then showers likely, mainly after 4pm. Mostly cloudy, with a high near 72. Chance of precipitation is 70%.

    High: 72 °F

    Rain Likely

  • Friday Night

    Friday Night: Showers likely before 10pm, then rain, mainly between 10pm and 4am. Low around 55. Chance of precipitation is 90%.

    Low: 55 °F

    Rain

  • Saturday

    Saturday: A chance of rain before 10am. Partly sunny, with a high near 67.

    High: 67 °F

    Chance Rain
    then Mostly
    Sunny

  • Saturday Night

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

    Low: 53 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 64. East wind around 10 mph.
Veterans Day
Sunny, with a high near 84. East wind around 5 mph becoming west in the afternoon.
Wednesday Night
Mostly clear, with a low around 63. South southwest wind around 5 mph becoming east northeast after midnight.
Thursday
Sunny, with a high near 79. East northeast wind around 5 mph becoming calm in the morning.
Thursday Night
Rain likely, mainly after 4am. Mostly cloudy, with a low around 63. Calm wind becoming south around 5 mph in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain likely before 10am, then showers likely, mainly after 4pm. Mostly cloudy, with a high near 72. Chance of precipitation is 70%.
Friday Night
Showers likely before 10pm, then rain, mainly between 10pm and 4am. Low around 55. Chance of precipitation is 90%.
Saturday
A chance of rain before 10am. Partly sunny, with a high near 67.
Saturday Night
Partly cloudy, with a low around 53.
Sunday
Sunny, with a high near 68.
Sunday Night
A chance of rain. Partly cloudy, with a low around 54.
Monday
Rain likely. Mostly cloudy, with a high near 65.
Monday Night
Rain likely. Mostly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Diamond Bar CA
 34°N 117.82°W (Elev. 1014 ft)
Last Update:
12:32 am PST Nov 11, 2026
Forecast Valid:
1am PST Nov 11, 2026-6pm PST Nov 17, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation