Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

56°F

13°C

Humidity 20%
Wind Speed S 5 MPH
Barometer NA
Dewpoint 16°F (-9°C)
Visibility NA
Last update 21 Jan 08:05 AM PST
Extended Forecast for

7 Miles SSW Brentwood CA

  • Today

    Today: Patchy fog between 10am and 11am.  Otherwise, cloudy, with a high near 54. Calm wind.

    High: 54 °F

    Patchy Fog
    then Cloudy

  • Tonight

    Tonight: Cloudy, with a low around 47. Light and variable wind.

    Low: 47 °F

    Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 60. West wind 3 to 5 mph.

    High: 60 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 4am.  Otherwise, partly cloudy, with a low around 45. Southwest wind around 6 mph.

    Low: 45 °F

    Partly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 10am.  Otherwise, mostly sunny, with a high near 55. Light and variable wind becoming north around 5 mph in the afternoon.

    High: 55 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Saturday Night

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

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 54.

    High: 54 °F

    Partly Sunny

Detailed Forecast

Today
Patchy fog between 10am and 11am. Otherwise, cloudy, with a high near 54. Calm wind.
Tonight
Cloudy, with a low around 47. Light and variable wind.
Thursday
Partly sunny, with a high near 60. West wind 3 to 5 mph.
Thursday Night
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 45. Southwest wind around 6 mph.
Friday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 55. Light and variable wind becoming north around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 56.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Partly sunny, with a high near 54.
Sunday Night
Mostly cloudy, with a low around 41.
Monday
Partly sunny, with a high near 56.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly cloudy, with a high near 56.
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ABOUT THIS FORECAST

 
Point Forecast:
7 Miles SSW Brentwood CA
 37.83°N 121.74°W (Elev. 932 ft)
2:13 am PST Jan 21, 2026
8am PST Jan 21, 2026-6pm PST Jan 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