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

54°F

12°C

Humidity 26%
Wind Speed SSE 7 MPH
Barometer NA
Dewpoint 21°F (-6°C)
Visibility NA
Last update 21 Jan 10:35 AM PST
Extended Forecast for

2 Miles SSE Clayton CA

  • Today

    Today: Cloudy, with a high near 58. Light north wind.

    High: 58 °F

    Cloudy

  • Tonight

    Tonight: Cloudy, with a low around 48. Light southwest wind.

    Low: 48 °F

    Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 62. West southwest wind 3 to 6 mph.

    High: 62 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 47. Southwest wind around 6 mph.

    Low: 47 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 58. Light and variable wind becoming north northeast around 5 mph in the morning.

    High: 58 °F

    Mostly Sunny

  • Friday Night

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

    Low: 44 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Saturday Night

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

    Low: 42 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 57.

    High: 57 °F

    Partly Sunny

Detailed Forecast

Today
Cloudy, with a high near 58. Light north wind.
Tonight
Cloudy, with a low around 48. Light southwest wind.
Thursday
Partly sunny, with a high near 62. West southwest wind 3 to 6 mph.
Thursday Night
Partly cloudy, with a low around 47. Southwest wind around 6 mph.
Friday
Mostly sunny, with a high near 58. Light and variable wind becoming north northeast around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 44.
Saturday
Sunny, with a high near 59.
Saturday Night
Mostly clear, with a low around 42.
Sunday
Partly sunny, with a high near 57.
Sunday Night
Mostly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 59.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Partly sunny, with a high near 60.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Clayton CA
 37.92°N 121.93°W (Elev. 600 ft)
2:13 am PST Jan 21, 2026
10am 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