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

69°F

21°C

Humidity 56%
Wind Speed SW 17 MPH
Barometer NA
Dewpoint 53°F (12°C)
Visibility NA
Last update 21 Jun 03:59 PM PDT
Extended Forecast for

10 Miles SW Quartz Hill CA

Heat Advisory June 23, 08:00am until June 25, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Clear, with a low around 56. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 56 °F

    Clear and
    Breezy then
    Clear

  • Monday

    Monday: Sunny, with a high near 75. 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: 75 °F

    Sunny then
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Clear, with a low around 62. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 62 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 79. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 62.

    Low: 62 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 74. Breezy.

    High: 74 °F

    Sunny then
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59. Breezy.

    Low: 59 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

Detailed Forecast

Tonight
Clear, with a low around 56. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 75. 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.
Monday Night
Clear, with a low around 62. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Sunny, with a high near 79. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 65. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Clear, with a low around 62.
Thursday
Sunny, with a high near 74. Breezy.
Thursday Night
Mostly clear, with a low around 59. Breezy.
Friday
Sunny, with a high near 72. Breezy.
Friday Night
Clear, with a low around 57. Breezy.
Saturday
Sunny, with a high near 68. Breezy.
Saturday Night
Clear, with a low around 54. Breezy.
Sunday
Sunny, with a high near 66. Breezy.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
10 Miles SW Quartz Hill CA
 34.56°N 118.35°W (Elev. 4629 ft)
Last Update:
1:38 pm PDT Jun 21, 2026
Forecast Valid:
5pm PDT Jun 21, 2026-6pm PDT Jun 28, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation