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

73°F

23°C

Humidity 29%
Wind Speed SW 9 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Last update 20 Aug 05:59 AM PDT
Extended Forecast for

7 Miles SW Quartz Hill CA

Heat Advisory August 20, 06:38am until August 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 20, 06:38am until August 20, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Today

    High: 93 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 11pm. Partly cloudy, with a low around 73. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 73 °F

    Slight Chance
    T-storms and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 88. Breezy, with a southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 88 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 71. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 71 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Saturday

    Saturday: Sunny, with a high near 87. Breezy, with a west southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 87 °F

    Sunny then
    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 70. Breezy.

    Low: 70 °F

    Mostly Clear
    and Breezy
    then Clear

  • Sunday

    Sunday: Sunny, with a high near 88. Breezy.

    High: 88 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 70. Breezy.

    Low: 70 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

Detailed Forecast

Today
Sunny, with a high near 93. Breezy, with a southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Tonight
A 20 percent chance of showers and thunderstorms after 11pm. Partly cloudy, with a low around 73. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Friday
Mostly sunny, with a high near 88. Breezy, with a southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
Mostly clear, with a low around 71. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Saturday
Sunny, with a high near 87. Breezy, with a west southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Saturday Night
Mostly clear, with a low around 70. Breezy.
Sunday
Sunny, with a high near 88. Breezy.
Sunday Night
Mostly clear, with a low around 70. Breezy.
Monday
Sunny, with a high near 86. Breezy.
Monday Night
Mostly clear, with a low around 71. Breezy.
Tuesday
Sunny, with a high near 88.
Tuesday Night
Mostly clear, with a low around 72. Breezy.
Wednesday
Sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
7 Miles SW Quartz Hill CA
 34.59°N 118.3°W (Elev. 4199 ft)
Last Update:
1:31 am PDT Aug 20, 2026
Forecast Valid:
6am PDT Aug 20, 2026-6pm PDT Aug 26, 2026
 
Forecast Discussion
 
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