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

48°F

9°C

Humidity 24%
Wind Speed N 11 MPH
Barometer NA
Dewpoint 13°F (-11°C)
Visibility NA
Wind Chill43°F (6°C)
Last update 04 Dec 05:20 PM PST
Extended Forecast for

3 Miles NNE San Ramon CA

  • Tonight

    Tonight: Mostly clear, with a low around 40. North northeast wind around 5 mph becoming calm  in the evening.

    Low: 40 °F

    Mostly Clear

  • Friday

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

    High: 63 °F

    Sunny

  • Friday Night

    Friday Night: Patchy fog after 3am.  Otherwise, mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 7am.  Otherwise, sunny, with a high near 64. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 64 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 4am.  Otherwise, partly cloudy, with a low around 43. North northeast wind 3 to 5 mph.

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 10am.  Otherwise, partly sunny, with a high near 63.

    High: 63 °F

    Patchy Fog
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 10pm.  Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Patchy Fog

  • Monday

    Monday: Areas of fog before 10am.  Otherwise, mostly sunny, with a high near 64.

    High: 64 °F

    Areas Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Patchy fog after 5am.  Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy
    then Patchy
    Fog

Detailed Forecast

Tonight
Mostly clear, with a low around 40. North northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 63. Calm wind becoming north northwest around 5 mph in the afternoon.
Friday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 42. Calm wind.
Saturday
Patchy fog before 7am. Otherwise, sunny, with a high near 64. Calm wind becoming northwest around 6 mph in the afternoon.
Saturday Night
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 43. North northeast wind 3 to 5 mph.
Sunday
Patchy fog before 10am. Otherwise, partly sunny, with a high near 63.
Sunday Night
Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 43.
Monday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 64.
Monday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 43.
Tuesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 64.
Tuesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44.
Wednesday
Areas of fog. Otherwise, mostly sunny, with a high near 65.
Wednesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 45.
Thursday
Patchy fog. Otherwise, mostly sunny, with a high near 66.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE San Ramon CA
 37.8°N 121.93°W (Elev. 640 ft)
12:26 pm PST Dec 4, 2025
5pm PST Dec 4, 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