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

85°F

29°C

Humidity 22%
Wind Speed SSW 6 MPH
Barometer NA
Dewpoint 42°F (6°C)
Visibility NA
Heat Index82°F (28°C)
Last update 11 Nov 12:57 PM PST
Extended Forecast for

Diamond Bar CA

  • Veterans Day

    Veterans Day: Sunny, with a high near 84. West wind around 5 mph.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 63. South southwest wind around 5 mph becoming east northeast after midnight.

    Low: 63 °F

    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. Increasing clouds, with a low around 60. 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: 60 °F

    Chance Rain
    then Rain
    Likely

  • Friday

    Friday: Rain likely, mainly after 4pm. Mostly cloudy, with a high near 68. East wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 68 °F

    Rain Likely

  • Friday Night

    Friday Night: Rain, mainly before 4am. Low around 58. Chance of precipitation is 90%.

    Low: 58 °F

    Rain

  • Saturday

    Saturday: A 30 percent chance of rain before 10am. Partly sunny, with a high near 68.

    High: 68 °F

    Chance Rain
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

Detailed Forecast

Veterans Day
Sunny, with a high near 84. West wind around 5 mph.
Tonight
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. Increasing clouds, with a low around 60. 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, mainly after 4pm. Mostly cloudy, with a high near 68. East wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain, mainly before 4am. Low around 58. Chance of precipitation is 90%.
Saturday
A 30 percent chance of rain before 10am. Partly sunny, with a high near 68.
Saturday Night
Partly cloudy, with a low around 56.
Sunday
Mostly sunny, with a high near 69.
Sunday Night
A chance of rain, mainly after 4am. Mostly cloudy, with a low around 54.
Monday
Rain. Mostly cloudy, with a high near 65.
Monday Night
Rain. Mostly cloudy, with a low around 50.
Tuesday
A slight chance of rain. Mostly sunny, with a high near 63.
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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:
11:41 am PST Nov 11, 2026
Forecast Valid:
1pm PST Nov 11, 2026-6pm PST Nov 17, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation