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

Tracking Two Storms Impacting the Central and Eastern U.S. Through This Weekend

Two storm systems will track through the central and eastern U.S. through this weekend with areas of gusty winds, rain, and heavy snow. Severe thunderstorms are forecast Friday from the central Gulf Coast into parts of the lower Mississippi, Tennessee and Ohio Valleys. Heavy to excessive rainfall is forecast from the lower Mississippi River Valley to the Tennessee Valley which may bring flooding. Read More >

Hazardous Weather Conditions

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

33°F

1°C

Humidity 60%
Wind Speed N 29 MPH
Barometer NA
Dewpoint 21°F (-6°C)
Visibility NA
Wind Chill19°F (-7°C)
Last update 09 Jan 12:25 AM PST
Extended Forecast for

Clayton CA

Cold Weather Advisory January 9, 01:00am until January 9, 09:00am
Click here for hazard details and duration
Cold Weather Advisory

  • Overnight

    Overnight: Partly cloudy, with a low around 37. East northeast wind around 9 mph.

    Low: 37 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 49. East northeast wind 7 to 9 mph.

    High: 49 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 36. East wind 3 to 5 mph.

    Low: 36 °F

    Mostly Clear

  • Saturday

    Saturday: Areas of frost before 9am. Otherwise, mostly sunny, with a high near 50. East northeast wind around 8 mph.

    High: 50 °F

    Areas Frost
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 38. Light east northeast wind.

    Low: 38 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 52.

    High: 52 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 37. East northeast wind around 9 mph.
Friday
Sunny, with a high near 49. East northeast wind 7 to 9 mph.
Friday Night
Mostly clear, with a low around 36. East wind 3 to 5 mph.
Saturday
Areas of frost before 9am. Otherwise, mostly sunny, with a high near 50. East northeast wind around 8 mph.
Saturday Night
Mostly cloudy, with a low around 38. Light east northeast wind.
Sunday
Partly sunny, with a high near 52.
Sunday Night
Mostly clear, with a low around 39.
Monday
Sunny, with a high near 54.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Sunny, with a high near 56.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 58.
Wednesday Night
Mostly clear, with a low around 44.
Thursday
Sunny, with a high near 59.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
Last Update:
12:26 am PST Jan 9, 2026
Forecast Valid:
12am PST Jan 9, 2026-6pm PST Jan 15, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation