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

55°F

13°C

Humidity 38%
Wind Speed NNW 7 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility NA
Last update 14 Mar 12:05 PM PDT
Extended Forecast for

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 54. West wind 6 to 9 mph becoming northeast after midnight.

    Low: 54 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81. East northeast wind 5 to 9 mph becoming north northwest in the morning. Winds could gust as high as 18 mph.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58. North northwest wind 5 to 8 mph becoming light and variable  after midnight.

    Low: 58 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 84. Calm wind becoming north northeast around 6 mph in the afternoon.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 60. North northwest wind around 5 mph becoming calm  after midnight.

    Low: 60 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 61.

    Low: 61 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 54. West wind 6 to 9 mph becoming northeast after midnight.
Sunday
Sunny, with a high near 81. East northeast wind 5 to 9 mph becoming north northwest in the morning. Winds could gust as high as 18 mph.
Sunday Night
Partly cloudy, with a low around 58. North northwest wind 5 to 8 mph becoming light and variable after midnight.
Monday
Sunny, with a high near 84. Calm wind becoming north northeast around 6 mph in the afternoon.
Monday Night
Clear, with a low around 60. North northwest wind around 5 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Clear, with a low around 61.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Sunny, with a high near 90.
Friday Night
Partly cloudy, with a low around 64.
Saturday
Sunny, with a high near 85.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
1:26 pm PDT Mar 14, 2026
7pm 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