Winter Weather Across Portions of the Mid-Atlantic; Heavy Rain Along the Gulf Coast and Southeast

A storm system will continue to slowly move through the Gulf Coast and Southeast U.S. over the next couple of days, bringing a heavy rainfall threat through the weekend. Isolated instances of flooding may occur. On the north side of this storm system, colder air will support areas of mixed wintry precipitation and light snow from the Tennessee Valley to the Mid-Atlantic Friday. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

53°F

12°C

Humidity 47%
Wind Speed N 13 MPH
Barometer NA
Dewpoint 33°F (1°C)
Visibility NA
Last update 05 Dec 03:50 AM PST
Extended Forecast for

3 Miles N San Ramon CA

Cold Weather Advisory December 5, 04:12am until December 5, 08:00am
Click here for hazard details and duration
...
  •  
    Cold Weather Advisory December 5, 04:12am until December 5, 08:00am

    NOW until 8:00am Fri

    Cold Weather Advisory

  • Today

    High: 61 °F

    Areas Frost
    then Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 40. Calm wind becoming northwest around 6 mph after midnight.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 62. Northwest wind 5 to 8 mph.

    High: 62 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 1am.  Otherwise, mostly clear, with a low around 42. Light northwest wind.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 7am.  Otherwise, mostly sunny, with a high near 63. Calm wind becoming north northwest 5 to 7 mph in the afternoon.

    High: 63 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Monday

    Monday: Areas of fog before 10am.  Otherwise, mostly sunny, with a high near 63.

    High: 63 °F

    Areas Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog after 3am.  Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

Detailed Forecast

Today
Areas of frost before 9am. Otherwise, sunny, with a high near 61. Calm wind becoming northwest 5 to 8 mph in the afternoon.
Tonight
Mostly clear, with a low around 40. Calm wind becoming northwest around 6 mph after midnight.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 62. Northwest wind 5 to 8 mph.
Saturday Night
Patchy fog after 1am. Otherwise, mostly clear, with a low around 42. Light northwest wind.
Sunday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 63. Calm wind becoming north northwest 5 to 7 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 63.
Monday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 43.
Tuesday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 64.
Tuesday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 45.
Wednesday
Areas of fog. Otherwise, mostly sunny, with a high near 65.
Wednesday Night
Patchy fog. Otherwise, mostly clear, with a low around 45.
Thursday
Areas of fog. Otherwise, mostly sunny, with a high near 65.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles N San Ramon CA
 37.8°N 121.96°W (Elev. 604 ft)
1:40 am PST Dec 5, 2025
4am PST Dec 5, 2025-6pm PST Dec 11, 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