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

57°F

14°C

Humidity 19%
Wind Speed NNW 6 MPH
Barometer NA
Dewpoint 16°F (-9°C)
Visibility NA
Last update 08 Dec 12:20 AM PST
Extended Forecast for

4 Miles S Clayton CA

  • Overnight

    Overnight: Mostly clear, with a low around 44. Light north northeast wind.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 55. North northeast wind 3 to 5 mph.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47. Light north wind.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 55. North wind 3 to 5 mph.

    High: 55 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 45. Light and variable wind.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 56.

    High: 56 °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 55.

    High: 55 °F

    Sunny

  • Thursday Night

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

    Low: 44 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 44. Light north northeast wind.
Monday
Sunny, with a high near 55. North northeast wind 3 to 5 mph.
Monday Night
Mostly clear, with a low around 47. Light north wind.
Tuesday
Sunny, with a high near 55. North wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 45. Light and variable wind.
Wednesday
Sunny, with a high near 56.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Sunny, with a high near 55.
Thursday Night
Mostly clear, with a low around 44.
Friday
Sunny, with a high near 53.
Friday Night
Mostly clear, with a low around 44.
Saturday
Sunny, with a high near 53.
Saturday Night
Partly cloudy, with a low around 45.
Sunday
Mostly sunny, with a high near 53.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
12:26 am PST Dec 8, 2025
12am PST Dec 8, 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