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

GRASS MOUNTAIN (GMTC1)

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

NA

59°F

15°C

Humidity 67%
Wind Speed SSW 19 MPH
Barometer NA
Dewpoint 48°F (9°C)
Visibility NA
Last update 12 Nov 03:59 PM PST
Extended Forecast for

10 Miles WSW Quartz Hill CA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 70. South wind around 15 mph, with gusts as high as 20 mph.

    High: 70 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 49. South wind 5 to 10 mph.

    Low: 49 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of rain. Mostly cloudy, with a high near 58. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 58 °F

    Chance Rain
    and Breezy

  • Friday Night

    Friday Night: Rain likely, mainly after 10pm. Mostly cloudy, with a low around 46. Breezy, with a west southwest wind 15 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Rain Likely
    and Breezy

  • Saturday

    Saturday: Mostly sunny, with a high near 58. West northwest wind around 10 mph becoming southwest in the afternoon.

    High: 58 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A slight chance of rain after 4am. Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Monday

    Monday: A chance of rain, mainly after 10am. Mostly cloudy, with a high near 51.

    High: 51 °F

    Chance Rain

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 70. South wind around 15 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, with a low around 49. South wind 5 to 10 mph.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 58. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain likely, mainly after 10pm. Mostly cloudy, with a low around 46. Breezy, with a west southwest wind 15 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Mostly sunny, with a high near 58. West northwest wind around 10 mph becoming southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 44.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
A slight chance of rain after 4am. Partly cloudy, with a low around 44.
Monday
A chance of rain, mainly after 10am. Mostly cloudy, with a high near 51.
Monday Night
A chance of rain, mainly before 4am. Mostly cloudy, with a low around 39.
Tuesday
A slight chance of rain. Mostly sunny, with a high near 48.
Tuesday Night
Mostly clear, with a low around 36.
Wednesday
Mostly sunny, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
10 Miles WSW Quartz Hill CA
 34.6°N 118.39°W (Elev. 3373 ft)
Last Update:
1:52 pm PST Nov 12, 2026
Forecast Valid:
4pm PST Nov 12, 2026-6pm PST Nov 18, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation