Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds in the North-Central U.S.

A prolonged atmospheric river will continue impacting the Pacific Northwest with heavy rainfall which has lead to areas of urban and river flooding along with gusty winds into Thursday. A clipper will bring heavy snow, some mixed wintry precipitation, and gusty to high winds across the northern Plains, Upper Midwest, and the Great Lakes into Thursday morning. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

62°F

17°C

Humidity 23%
Wind Speed NW 9 MPH
Barometer NA
Dewpoint 24°F (-4°C)
Visibility NA
Last update 09 Dec 01:35 PM PST
Extended Forecast for

4 Miles S Clayton CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 64. North wind around 5 mph.

    High: 64 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a steady temperature around 53. North northeast wind 3 to 5 mph.

    Low: 53 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 57. North northeast wind around 6 mph.

    High: 57 °F

    Sunny

  • Wednesday Night

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

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 56. North northeast wind around 6 mph.

    High: 56 °F

    Sunny

  • Thursday Night

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

    Low: 44 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 64. North wind around 5 mph.
Tonight
Mostly clear, with a steady temperature around 53. North northeast wind 3 to 5 mph.
Wednesday
Sunny, with a high near 57. North northeast wind around 6 mph.
Wednesday Night
Mostly clear, with a low around 46. Light northeast wind.
Thursday
Sunny, with a high near 56. North northeast wind around 6 mph.
Thursday Night
Mostly clear, with a low around 44.
Friday
Sunny, with a high near 53.
Friday Night
Mostly clear, with a low around 43.
Saturday
Mostly sunny, with a high near 52.
Saturday Night
Mostly clear, with a low around 43.
Sunday
Mostly sunny, with a high near 52.
Sunday Night
Partly cloudy, with a low around 45.
Monday
A slight chance of rain. Mostly sunny, with a high near 54.
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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 pm PST Dec 9, 2025
1pm PST Dec 9, 2025-6pm PST Dec 15, 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