Tracking Atmospheric River in the Northwest U.S. and Clipper with Winter Weather in the Northeast U.S.

A prolonged atmospheric river will continue to bring gusty winds, heavy rainfall which may lead to urban and river flooding with possible landslides, and heavy inter-mountain snow over the Pacific Northwest into the northern Rockies through Thursday. A clipper will cross the Great Lakes and Northeast U.S. into Thursday with areas of moderate to heavy snow and mixed wintry precipitation. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

58°F

14°C

Humidity 34%
Wind Speed N 20 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility NA
Last update 11 Dec 02:50 AM PST
Extended Forecast for

3 Miles N San Ramon CA

  • Overnight

    Overnight: Patchy dense fog.  Otherwise, partly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Patchy Dense
    Fog

  • Thursday

    Thursday: Patchy dense fog between 8am and 9am.  Otherwise, sunny, with a high near 57. Northwest wind 3 to 6 mph.

    High: 57 °F

    Patchy Dense
    Fog then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 40. Calm wind becoming northwest around 5 mph after midnight.

    Low: 40 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 58. North northwest wind 3 to 5 mph.

    High: 58 °F

    Sunny

  • Friday Night

    Friday Night: Patchy fog after 3am.  Otherwise, mostly clear, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 8am.  Otherwise, sunny, with a high near 62.

    High: 62 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Areas of fog after 1am.  Otherwise, mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear
    then Areas
    Fog

  • Sunday

    Sunday: Areas of fog before 10am.  Otherwise, mostly sunny, with a high near 60.

    High: 60 °F

    Areas Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Patchy fog before midnight, then patchy fog after 5am.  Otherwise, partly cloudy, with a low around 41.

    Low: 41 °F

    Patchy Fog

Detailed Forecast

Overnight
Patchy dense fog. Otherwise, partly cloudy, with a low around 41. Calm wind.
Thursday
Patchy dense fog between 8am and 9am. Otherwise, sunny, with a high near 57. Northwest wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 40. Calm wind becoming northwest around 5 mph after midnight.
Friday
Sunny, with a high near 58. North northwest wind 3 to 5 mph.
Friday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 40. Calm wind.
Saturday
Patchy fog before 8am. Otherwise, sunny, with a high near 62.
Saturday Night
Areas of fog after 1am. Otherwise, mostly clear, with a low around 40.
Sunday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 60.
Sunday Night
Patchy fog before midnight, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 41.
Monday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 61.
Monday Night
A slight chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 48.
Tuesday
A chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 63.
Tuesday Night
A chance of rain. Areas of fog. Otherwise, mostly cloudy, with a low around 50.
Wednesday
A slight chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles N San Ramon CA
 37.8°N 121.96°W (Elev. 604 ft)
2:25 am PST Dec 11, 2025
3am PST Dec 11, 2025-6pm PST Dec 17, 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