Tracking Late Season Winter Storms; Unusual Early-Season Heat Wave in the Southwest

Heavy snow and high winds continue in the Great Lakes and Northeast. A moderate atmospheric river will continue to bring heavy precipitation to the Pacific Northwest and northern Rockies. A major winter storm will develop across the northern High Plains tonight into Saturday and rapidly strengthen as it moves into the Great Lakes on Sunday. Above-average temperatures expected in the Southwest. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

68°F

20°C

Humidity 17%
Wind Speed WNW 0 MPH
Barometer NA
Dewpoint 21°F (-6°C)
Visibility NA
Last update 13 Mar 11:35 AM PDT
Extended Forecast for

Clayton CA

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 51. South southwest wind around 9 mph.

    Low: 51 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 75. South southwest wind 6 to 9 mph becoming northwest in the morning.

    High: 75 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 54. West wind around 8 mph.

    Low: 54 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 81. West northwest wind 6 to 9 mph becoming north in the morning.

    High: 81 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 59. North northwest wind 5 to 8 mph becoming light and variable  after midnight.

    Low: 59 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 61.

    Low: 61 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 61.

    Low: 61 °F

    Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 51. South southwest wind around 9 mph.
Saturday
Sunny, with a high near 75. South southwest wind 6 to 9 mph becoming northwest in the morning.
Saturday Night
Mostly clear, with a low around 54. West wind around 8 mph.
Sunday
Mostly sunny, with a high near 81. West northwest wind 6 to 9 mph becoming north in the morning.
Sunday Night
Partly cloudy, with a low around 59. North northwest wind 5 to 8 mph becoming light and variable after midnight.
Monday
Sunny, with a high near 85.
Monday Night
Clear, with a low around 61.
Tuesday
Sunny, with a high near 87.
Tuesday Night
Clear, with a low around 61.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Clear, with a low around 62.
Thursday
Sunny, with a high near 88.
Thursday Night
Mostly clear, with a low around 63.
Friday
Mostly sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
1:54 pm PDT Mar 13, 2026
3pm PDT Mar 13, 2026-6pm PDT Mar 20, 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