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

82°F

28°C

Humidity 23%
Wind Speed SSW 14 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Heat Index80°F (27°C)
Last update 23 Jun 11:59 AM PDT
Extended Forecast for

11 Miles WSW Quartz Hill CA

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

    NOW until 9:00pm Thu

    Heat Advisory

  • This Afternoon

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 25 mph.

    High: 84 °F

    Sunny then
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Clear, with a low around 60. Breezy, with a west southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 60 °F

    Clear and
    Breezy then
    Clear

  • Thursday

    Thursday: Sunny, with a high near 82. 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: 82 °F

    Sunny then
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 54. Breezy.

    Low: 54 °F

    Clear and
    Breezy then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 80. Breezy.

    High: 80 °F

    Sunny then
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 52. Breezy.

    Low: 52 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

Detailed Forecast

This Afternoon
Sunny, with a high near 85. Southwest wind around 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 60. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Sunny, with a high near 84. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 25 mph.
Wednesday Night
Clear, with a low around 60. Breezy, with a west southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Thursday
Sunny, with a high near 82. 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.
Thursday Night
Mostly clear, with a low around 54. Breezy.
Friday
Sunny, with a high near 80. Breezy.
Friday Night
Mostly clear, with a low around 52. Breezy.
Saturday
Sunny, with a high near 69. Breezy.
Saturday Night
Mostly clear, with a low around 48. Breezy.
Sunday
Sunny, with a high near 69.
Sunday Night
Clear, with a low around 48.
Monday
Sunny, with a high near 70.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
11 Miles WSW Quartz Hill CA
 34.6°N 118.39°W (Elev. 3373 ft)
Last Update:
12:47 pm PDT Jun 23, 2026
Forecast Valid:
12pm PDT Jun 23, 2026-6pm PDT Jun 29, 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