Dangerous Cold Weather for Most of the Country; Rare Winter Storm for the South; Fire Weather Concerns for Southern California

Arctic air will filter south and east through early this week. As this cold air moves across the South, a rare winter storm is forecast to develop from Texas, Gulf Coast States into the Southeast through early this week. Several new daily record low temperatures are expected, including new record-low maximum temperatures. For Southern California, fire weather concerns increase this week. Read More >

Current conditions at

Mt. Diablo (SJS02)

Lat: 37.881698°NLon: 121.914155°WElev: 3849.0ft.

NA

48°F

9°C

Humidity 15%
Wind Speed WNW 4 MPH
Barometer NA
Dewpoint 4°F (-16°C)
Visibility NA
Wind Chill47°F (8°C)
Last update 21 Jan 06:10 AM PST
Extended Forecast for

4 Miles S Clayton CA

Frost Advisory January 21, 05:24am until January 21, 09:00am
Click here for hazard details and duration
...
  •  
    Frost Advisory January 21, 05:24am until January 21, 09:00am

    NOW until 9:00am Tue

    Frost Advisory

  • Today

    High: 50 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a steady temperature around 44. Northeast wind 3 to 5 mph.

    Low: 44 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 53. East wind 5 to 7 mph becoming north northeast in the afternoon.

    High: 53 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 38. Northeast wind around 6 mph.

    Low: 38 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 54. Northeast wind around 7 mph.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 50. Calm wind becoming north around 6 mph in the afternoon.
Tonight
Mostly clear, with a steady temperature around 44. Northeast wind 3 to 5 mph.
Wednesday
Sunny, with a high near 53. East wind 5 to 7 mph becoming north northeast in the afternoon.
Wednesday Night
Clear, with a low around 38. Northeast wind around 6 mph.
Thursday
Sunny, with a high near 54. Northeast wind around 7 mph.
Thursday Night
Partly cloudy, with a low around 40.
Friday
Mostly sunny, with a high near 53.
Friday Night
Mostly clear, with a low around 38.
Saturday
A slight chance of snow. Mostly sunny, with a high near 45.
Saturday Night
A slight chance of snow before 10pm. Mostly clear, with a low around 34.
Sunday
Sunny, with a high near 44.
Sunday Night
Mostly clear, with a low around 33.
Monday
Sunny, with a high near 46.
Click Map For Forecast

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
12:26 am PST Jan 21, 2025
5am PST Jan 21, 2025-6pm PST Jan 27, 2025
 
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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