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

Hazardous Weather Conditions

Current conditions at

WHITTIER HILLS (WTHC1)

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

NA

74°F

23°C

Humidity 31%
Wind Speed ENE 11 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 18 Mar 07:57 AM PDT
Extended Forecast for

2 Miles WSW Diamond Bar CA

Extreme Heat Warning March 18, 08:45am until March 20, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning March 18, 08:45am until March 20, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Today

    High: 98 °F

    Hot

  • Tonight

    Tonight: Clear, with a low around 73. West southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.

    Low: 73 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 99. East northeast wind 5 to 10 mph becoming west southwest in the afternoon.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Clear, with a low around 73. West southwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 15 mph.

    Low: 73 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 97. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 97 °F

    Hot

  • Friday Night

    Friday Night: Clear, with a low around 73.

    Low: 73 °F

    Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 96.

    High: 96 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy

Detailed Forecast

Today
Sunny and hot, with a high near 98. East northeast wind 5 to 10 mph becoming west southwest in the afternoon. Winds could gust as high as 15 mph.
Tonight
Clear, with a low around 73. West southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.
Thursday
Sunny and hot, with a high near 99. East northeast wind 5 to 10 mph becoming west southwest in the afternoon.
Thursday Night
Clear, with a low around 73. West southwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 15 mph.
Friday
Sunny and hot, with a high near 97. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
Clear, with a low around 73.
Saturday
Sunny and hot, with a high near 96.
Saturday Night
Mostly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 88.
Sunday Night
Mostly clear, with a low around 63.
Monday
Sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Diamond Bar CA
 34°N 117.85°W (Elev. 679 ft)
Last Update:
2:22 am PDT Mar 18, 2026
Forecast Valid:
8am PDT Mar 18, 2026-6pm PDT Mar 24, 2026
 
Forecast Discussion
 
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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