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

57°F

14°C

Humidity 61%
Wind Speed NW 8 MPH
Barometer NA
Dewpoint 44°F (7°C)
Visibility NA
Last update 14 Mar 08:35 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: Mostly clear, with a low around 56. Northwest wind around 9 mph.

    Low: 56 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 80. North wind 8 to 10 mph, with gusts as high as 21 mph.

    High: 80 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61. North northwest wind 6 to 9 mph becoming west southwest in the evening. Winds could gust as high as 20 mph.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 83. North wind 5 to 7 mph.

    High: 83 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 64. North northwest wind around 6 mph becoming southwest in the evening.

    Low: 64 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 65.

    Low: 65 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 56. Northwest wind around 9 mph.
Sunday
Sunny, with a high near 80. North wind 8 to 10 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 61. North northwest wind 6 to 9 mph becoming west southwest in the evening. Winds could gust as high as 20 mph.
Monday
Sunny, with a high near 83. North wind 5 to 7 mph.
Monday Night
Clear, with a low around 64. North northwest wind around 6 mph becoming southwest in the evening.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Clear, with a low around 65.
Wednesday
Sunny, with a high near 87.
Wednesday Night
Mostly clear, with a low around 64.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 67.
Friday
Sunny, with a high near 89.
Friday Night
Partly cloudy, 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)
1:26 pm PDT Mar 14, 2026
11pm PDT Mar 14, 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