Tracking Areas of Winter Weather and Heavy Rainfall

A cold front will move through the Great Lakes and Northeast U.S. today, bringing areas of snow and snow squalls which can bring rapid reductions to visibility and slick roads. A storm system will shift from the northern Gulf Coast through the Southeast U.S. today through Friday with areas of heavy to excessive rainfall and light snow further north. Heavy snow is also expected in the Rockies. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

46°F

8°C

Humidity 34%
Wind Speed N 8 MPH
Barometer NA
Dewpoint 20°F (-7°C)
Visibility NA
Wind Chill42°F (6°C)
Last update 04 Dec 09:50 AM PST
Extended Forecast for

3 Miles NNE San Ramon CA

  • Today

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

    High: 57 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 40. Light and variable wind.

    Low: 40 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 63. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 63 °F

    Sunny

  • Friday Night

    Friday Night: Patchy fog after 2am.  Otherwise, mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Mostly sunny, with a high near 62. Northwest wind 3 to 6 mph.

    High: 62 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy fog after midnight.  Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Areas of fog before 9am.  Otherwise, mostly sunny, with a high near 64.

    High: 64 °F

    Areas Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Patchy fog before 2am, then patchy fog after 5am.  Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: Areas of fog before 9am.  Otherwise, mostly sunny, with a high near 64.

    High: 64 °F

    Areas Fog
    then Sunny

Detailed Forecast

Today
Sunny, with a high near 57. North northeast wind around 6 mph.
Tonight
Mostly clear, with a low around 40. Light and variable wind.
Friday
Sunny, with a high near 63. Calm wind becoming northwest around 5 mph in the afternoon.
Friday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 42. Calm wind.
Saturday
Mostly sunny, with a high near 62. Northwest wind 3 to 6 mph.
Saturday Night
Patchy fog after midnight. Otherwise, partly cloudy, with a low around 43.
Sunday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 64.
Sunday Night
Patchy fog before 2am, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 43.
Monday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 64.
Monday Night
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 43.
Tuesday
Areas of fog. Otherwise, mostly sunny, with a high near 63.
Tuesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44.
Wednesday
Areas of fog. Otherwise, mostly sunny, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE San Ramon CA
 37.8°N 121.93°W (Elev. 640 ft)
2:09 am PST Dec 4, 2025
10am PST Dec 4, 2025-6pm PST Dec 10, 2025
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database