Major Winter Storm Ongoing in the Upper Midwest; Severe Weather Tonight from the Mid-South to the Ohio Valley

A major winter storm will continue to bring blizzard conditions, heavy snowfall, icing, and strong winds through Monday across the Upper Midwest and Upper Great Lakes. 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 through tonight, moving into the Mid-Atlantic Monday. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

66°F

19°C

Humidity 21%
Wind Speed NNW 16 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Last update 15 Mar 07:40 PM PDT
Extended Forecast for

4 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 65. North wind 6 to 9 mph.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 83. North wind 6 to 9 mph.

    High: 83 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 68. West northwest wind around 7 mph becoming south southwest after midnight.

    Low: 68 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86. Southwest wind 5 to 8 mph becoming northeast in the morning.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 70. North wind around 6 mph becoming southwest in the evening.

    Low: 70 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 70.

    Low: 70 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 71.

    Low: 71 °F

    Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 65. North wind 6 to 9 mph.
Monday
Sunny, with a high near 83. North wind 6 to 9 mph.
Monday Night
Clear, with a low around 68. West northwest wind around 7 mph becoming south southwest after midnight.
Tuesday
Sunny, with a high near 86. Southwest wind 5 to 8 mph becoming northeast in the morning.
Tuesday Night
Clear, with a low around 70. North wind around 6 mph becoming southwest in the evening.
Wednesday
Sunny, with a high near 87.
Wednesday Night
Clear, with a low around 70.
Thursday
Sunny, with a high near 88.
Thursday Night
Clear, with a low around 71.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 67.
Saturday
Mostly sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 60.
Sunday
Mostly sunny, with a high near 74.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
1:25 pm PDT Mar 15, 2026
8pm 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