Strong Atmospheric River Bringing Heavy Rain to the Pacific Northwest; Areas of Snow in the North-Central and Eastern U.S.

A strong atmospheric river will bring prolonged heavy rainfall along with gusty winds to the Pacific Northwest through much of this week. The heavy rainfall may lead to widespread urban and river flooding. Accumulating snow is expected over parts of the central Appalachians and Mid-Atlantic today as well as the Upper Midwest and the Upper Great Lakes this evening into Tuesday. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

54°F

12°C

Humidity 39%
Wind Speed N 7 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility NA
Last update 08 Dec 09:50 AM PST
Extended Forecast for

5 Miles NE San Ramon CA

  • Today

    Today: Patchy fog before 11am.  Otherwise, sunny, with a high near 54. Light north wind.

    High: 54 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog after midnight.  Otherwise, mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Areas of fog before 10am.  Otherwise, sunny, with a high near 58. Light north northeast wind.

    High: 58 °F

    Areas Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 11pm.  Otherwise, mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 9am.  Otherwise, sunny, with a high near 64. Light north northeast wind.

    High: 64 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

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

    Low: 43 °F

    Mostly Clear

  • Thursday

    Thursday: Patchy fog before 10am.  Otherwise, sunny, with a high near 62.

    High: 62 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Friday

    Friday: Patchy fog before 10am.  Otherwise, sunny, with a high near 61.

    High: 61 °F

    Patchy Fog
    then Sunny

Detailed Forecast

Today
Patchy fog before 11am. Otherwise, sunny, with a high near 54. Light north wind.
Tonight
Patchy fog after midnight. Otherwise, mostly clear, with a low around 42. Calm wind.
Tuesday
Areas of fog before 10am. Otherwise, sunny, with a high near 58. Light north northeast wind.
Tuesday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 42. Calm wind.
Wednesday
Patchy fog before 9am. Otherwise, sunny, with a high near 64. Light north northeast wind.
Wednesday Night
Mostly clear, with a low around 43.
Thursday
Patchy fog before 10am. Otherwise, sunny, with a high near 62.
Thursday Night
Mostly clear, with a low around 42.
Friday
Patchy fog before 10am. Otherwise, sunny, with a high near 61.
Friday Night
Patchy fog after 5am. Otherwise, mostly clear, with a low around 42.
Saturday
Patchy fog. Otherwise, mostly sunny, with a high near 62.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 43.
Sunday
Areas of fog. Otherwise, partly sunny, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NE San Ramon CA
 37.79°N 121.87°W (Elev. 801 ft)
6:22 am PST Dec 8, 2025
10am PST Dec 8, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

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