National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Snow in the Central/Southern Rockies; Below Average Temperatures in the Central and Eastern US

Moderate to heavy snowfall is expected in the central/southern Rockies and adjacent High Plains today. Lake-enhanced snowfall is expected downwind of the Great Lakes today. Showers and thunderstorms will be possible this evening into tonight across the western Gulf Coast states. Temperatures across much of the central and eastern CONUS will remain below average and chilly to end the week. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

42°F

6°C

Humidity 46%
Wind Speed N 18 MPH
Barometer NA
Dewpoint 22°F (-6°C)
Visibility NA
Wind Chill34°F (1°C)
Last update 03 Dec 10:50 AM PST
Extended Forecast for

3 Miles NNE San Ramon CA

  • Today

    Today: Mostly sunny, with a high near 60. North northeast wind 7 to 15 mph, with gusts as high as 24 mph.

    High: 60 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy frost between 4am and 5am. Otherwise, partly cloudy, with a low around 37. Light and variable wind.

    Low: 37 °F

    Partly Cloudy
    then Patchy
    Frost

  • Thursday

    Thursday: Patchy frost before 8am. Otherwise, mostly sunny, with a high near 58. Northeast wind 3 to 6 mph.

    High: 58 °F

    Patchy Frost
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 63. Calm wind becoming north northwest around 6 mph in the morning.

    High: 63 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 64.

    High: 64 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 45.

    Low: 45 °F

    Patchy Fog

  • Sunday

    Sunday: Areas of fog before 11am. Otherwise, mostly sunny, with a high near 63.

    High: 63 °F

    Areas Fog
    then Mostly
    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 60. North northeast wind 7 to 15 mph, with gusts as high as 24 mph.
Tonight
Patchy frost between 4am and 5am. Otherwise, partly cloudy, with a low around 37. Light and variable wind.
Thursday
Patchy frost before 8am. Otherwise, mostly sunny, with a high near 58. Northeast wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 40. Calm wind.
Friday
Sunny, with a high near 63. Calm wind becoming north northwest around 6 mph in the morning.
Friday Night
Mostly clear, with a low around 41.
Saturday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 64.
Saturday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 45.
Sunday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 63.
Sunday Night
Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 45.
Monday
Areas of fog. Otherwise, mostly sunny, with a high near 64.
Monday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44.
Tuesday
Areas of fog. Otherwise, mostly sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE San Ramon CA
 37.8°N 121.93°W (Elev. 640 ft)
Last Update:
8:40 am PST Dec 3, 2025
Forecast Valid:
11am PST Dec 3, 2025-6pm PST Dec 9, 2025
 
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