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

Hazardous Weather Conditions

Current conditions at

GRASS MOUNTAIN (GMTC1)

Lat: 34.64078°NLon: 118.41435°WElev: 4626.0ft.

NA

74°F

23°C

Humidity 33%
Wind Speed WSW 9 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Last update 18 Aug 08:59 PM PDT
Extended Forecast for

11 Miles W Quartz Hill CA

Heat Advisory August 18, 09:58pm until August 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 18, 09:58pm until August 20, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Tonight

    Low: 69 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90. Northwest wind 5 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph.

    High: 90 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 70. West wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 70 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91. West wind 5 to 15 mph becoming south southwest in the morning. Winds could gust as high as 25 mph.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 70. West wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.

    Low: 70 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 69. Northwest wind around 10 mph, with gusts as high as 15 mph.
Wednesday
Mostly sunny, with a high near 90. Northwest wind 5 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 70. West wind 5 to 15 mph, with gusts as high as 25 mph.
Thursday
Sunny, with a high near 91. West wind 5 to 15 mph becoming south southwest in the morning. Winds could gust as high as 25 mph.
Thursday Night
Mostly clear, with a low around 70. West wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Friday
Sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 69.
Saturday
Sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 67.
Sunday
Sunny, with a high near 85.
Sunday Night
Clear, with a low around 66.
Monday
Sunny, with a high near 84.
Monday Night
Clear, with a low around 66.
Tuesday
Sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
11 Miles W Quartz Hill CA
 34.65°N 118.43°W (Elev. 3832 ft)
Last Update:
7:37 pm PDT Aug 18, 2026
Forecast Valid:
9pm PDT Aug 18, 2026-6pm PDT Aug 25, 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