Major Winter Storm in the North-Central U.S.; Severe Weather from the Mid-South to Ohio Valley

A major winter storm will bring a swath of heavy snowfall, strong winds, blizzard conditions and freezing rain to the Northern Plains into the Great Lakes region. A line of storms will be capable of producing widespread damaging winds, tornadoes, and some large hail from the Mid-south to the Ohio Valley and the Southeast. Critical fire weather concerns shift to the southern Rockies and Plains. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

64°F

18°C

Humidity 18%
Wind Speed N 9 MPH
Barometer NA
Dewpoint 20°F (-7°C)
Visibility NA
Last update 15 Mar 03:25 PM PDT
Extended Forecast for

3 Miles S Clayton CA

Heat Advisory March 16, 10:00am until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  • Tonight

    Tonight: Partly cloudy, with a low around 61. North northeast wind 6 to 9 mph.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 83. North northeast wind 6 to 8 mph.

    High: 83 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 64. Southwest wind around 7 mph.

    Low: 64 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86. Light and variable wind becoming northeast 5 to 7 mph in the morning.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 66. North wind around 6 mph becoming west southwest in the evening.

    Low: 66 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 67.

    Low: 67 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 68.

    Low: 68 °F

    Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 61. North northeast wind 6 to 9 mph.
Monday
Sunny, with a high near 83. North northeast wind 6 to 8 mph.
Monday Night
Clear, with a low around 64. Southwest wind around 7 mph.
Tuesday
Sunny, with a high near 86. Light and variable wind becoming northeast 5 to 7 mph in the morning.
Tuesday Night
Clear, with a low around 66. North wind around 6 mph becoming west southwest in the evening.
Wednesday
Sunny, with a high near 87.
Wednesday Night
Clear, with a low around 67.
Thursday
Sunny, with a high near 88.
Thursday Night
Clear, with a low around 68.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 65.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 58.
Sunday
Mostly sunny, with a high near 75.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Clayton CA
 37.9°N 121.92°W (Elev. 1900 ft)
1:25 pm PDT Mar 15, 2026
4pm PDT Mar 15, 2026-6pm PDT Mar 22, 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