Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

56°F

13°C

Humidity 35%
Wind Speed NW 10 MPH
Barometer NA
Dewpoint 29°F (-2°C)
Visibility NA
Last update 07 Dec 04:50 PM PST
Extended Forecast for

Clayton CA

  • Tonight

    Tonight: Mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 56. Calm wind becoming north northeast around 5 mph in the morning.

    High: 56 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 57. Calm wind becoming north northeast around 5 mph in the morning.

    High: 57 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 42. Calm wind.
Monday
Sunny, with a high near 56. Calm wind becoming north northeast around 5 mph in the morning.
Monday Night
Mostly clear, with a low around 44. Calm wind.
Tuesday
Mostly sunny, with a high near 57. Calm wind becoming north northeast around 5 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 46. Calm wind.
Wednesday
Sunny, with a high near 59.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Sunny, with a high near 59.
Thursday Night
Mostly clear, with a low around 44.
Friday
Mostly sunny, with a high near 57.
Friday Night
Mostly clear, with a low around 44.
Saturday
Mostly sunny, with a high near 58.
Saturday Night
Partly cloudy, with a low around 44.
Sunday
Mostly sunny, with a high near 57.
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ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
5:02 pm PST Dec 7, 2025
5pm PST Dec 7, 2025-6pm PST Dec 14, 2025
 
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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