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

68°F

20°C

Humidity 70%
Wind Speed NE 17 MPH
Barometer NA
Dewpoint 58°F (14°C)
Visibility NA
Last update 10 Oct 09:57 PM PDT
Extended Forecast for

Diamond Bar CA

  • Tonight

    Tonight: A chance of showers before 11pm, then rain likely after 11pm. Cloudy, with a low around 67. South southwest wind 5 to 10 mph becoming west northwest in the evening. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Rain Likely

  • Sunday

    Sunday: Rain. High near 68. South southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 68 °F

    Rain then
    Rain Likely

  • Sunday Night

    Sunday Night: Showers, mainly after 11pm. Low around 58. South southwest wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 58 °F

    Showers

  • Columbus Day

    Columbus Day: Showers. High near 60. Southwest wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Showers

  • Monday Night

    Monday Night: A 50 percent chance of showers, mainly before 11pm. Mostly cloudy, with a low around 50. West southwest wind around 5 mph becoming calm after midnight. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 52.

    Low: 52 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 56.

    Low: 56 °F

    Clear

Detailed Forecast

Tonight
A chance of showers before 11pm, then rain likely after 11pm. Cloudy, with a low around 67. South southwest wind 5 to 10 mph becoming west northwest in the evening. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Rain. High near 68. South southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Showers, mainly after 11pm. Low around 58. South southwest wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Columbus Day
Showers. High near 60. Southwest wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
A 50 percent chance of showers, mainly before 11pm. Mostly cloudy, with a low around 50. West southwest wind around 5 mph becoming calm after midnight. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Sunny, with a high near 67.
Tuesday Night
Clear, with a low around 52.
Wednesday
Sunny, with a high near 76.
Wednesday Night
Clear, with a low around 56.
Thursday
Sunny, with a high near 83.
Thursday Night
Clear, with a low around 60.
Friday
Sunny, with a high near 87.
Friday Night
Clear, with a low around 63.
Saturday
Sunny, with a high near 88.
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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:
1:57 pm PDT Oct 10, 2026
Forecast Valid:
10pm PDT Oct 10, 2026-6pm PDT Oct 17, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation