Tracking a Winter Storm; Unusual Early-Season Heat Wave in the Southwest

A major winter storm will organize across the Northern Plains today and then rapidly strengthen as it moves into the Great Lakes on Sunday. Heavy snow and blowing snow are likely to persist over the Great Lakes into Monday night. Dry and gusty winds will produce a critical fire risk across the central/southern Plains. An early heatwave will begin to intensify over the western U.S. into next week. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

58°F

14°C

Humidity 58%
Wind Speed N 15 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Last update 15 Mar 12:40 AM 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
  • Overnight

    Overnight: Mostly clear, with a steady temperature around 54. Northwest wind around 9 mph.

    Low: 54 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 80. North wind 7 to 9 mph, with gusts as high as 20 mph.

    High: 80 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62. North wind 6 to 8 mph.

    Low: 62 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 83. North wind 5 to 8 mph.

    High: 83 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 63. North northwest wind around 6 mph becoming south southwest after midnight.

    Low: 63 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 66.

    Low: 66 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 66.

    Low: 66 °F

    Clear

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 54. Northwest wind around 9 mph.
Sunday
Sunny, with a high near 80. North wind 7 to 9 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 62. North wind 6 to 8 mph.
Monday
Sunny, with a high near 83. North wind 5 to 8 mph.
Monday Night
Clear, with a low around 63. North northwest wind around 6 mph becoming south southwest after midnight.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Clear, with a low around 66.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Clear, with a low around 66.
Thursday
Sunny, with a high near 88.
Thursday Night
Clear, with a low around 68.
Friday
Sunny, with a high near 90.
Friday Night
Mostly clear, with a low around 68.
Saturday
Sunny, with a high near 85.
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)
2:40 am PDT Mar 15, 2026
3am PDT Mar 15, 2026-6pm PDT Mar 21, 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