Critical Fire Weather in the Southern High Plains; Heavy Snow in the Great Lakes and Northeast U.S.

Gusty winds and low relative humidity will bring elevated to critical fire weather conditions to the southern High Plains through the weekend. A winter storm will track across the Great Lakes and Northeast U.S. into Saturday with areas of wintry mix and heavy snow from northern New York through southern Maine. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

NA

28°F

-2°C

Humidity 99%
Wind Speed N 0 MPH
Barometer NA
Dewpoint 28°F (-2°C)
Visibility NA
Last update 20 Feb 03:25 AM PST
Extended Forecast for

2 Miles S Clayton CA

Cold Weather Advisory February 21, 03:11am until February 21, 09:00am
Click here for hazard details and duration
Cold Weather Advisory
  •  
    Cold Weather Advisory February 21, 03:11am until February 21, 09:00am

    NOW until 9:00am Sat

    Cold Weather Advisory

  • Overnight

    Low: 39 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 59. South wind 7 to 11 mph, with gusts as high as 23 mph.

    High: 59 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 44. South wind around 10 mph, with gusts as high as 22 mph.

    Low: 44 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 64. South wind 7 to 9 mph.

    High: 64 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 46. Northwest wind around 6 mph becoming light and variable  after midnight.

    Low: 46 °F

    Mostly Cloudy

  • Monday

    Monday: A 10 percent chance of rain after 4pm.  Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: Rain likely, mainly after 4am.  Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain.  Mostly cloudy, with a high near 60.

    High: 60 °F

    Rain

Detailed Forecast

Overnight
Mostly cloudy, with a low around 39. South southeast wind around 6 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 59. South wind 7 to 11 mph, with gusts as high as 23 mph.
Saturday Night
Partly cloudy, with a low around 44. South wind around 10 mph, with gusts as high as 22 mph.
Sunday
Partly sunny, with a high near 64. South wind 7 to 9 mph.
Sunday Night
Mostly cloudy, with a low around 46. Northwest wind around 6 mph becoming light and variable after midnight.
Monday
A 10 percent chance of rain after 4pm. Partly sunny, with a high near 65.
Monday Night
Rain likely, mainly after 4am. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Tuesday
Rain. Mostly cloudy, with a high near 60.
Tuesday Night
Rain, mainly before 10pm. Cloudy, with a low around 54.
Wednesday
A chance of rain. Mostly cloudy, with a high near 62.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 50.
Thursday
A slight chance of rain. Partly sunny, with a high near 66.
Thursday Night
A slight chance of rain. Mostly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 68.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Clayton CA
 37.92°N 121.93°W (Elev. 600 ft)
12:26 am PST Feb 21, 2026
3am PST Feb 21, 2026-6pm PST Feb 27, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database