Heavy Precipitation in the West; Wintry Mix in the North; Fire Weather in the High Plains

Pacific moisture will continue to bring locally heavy coastal/lower elevation rain and heavy mountain snow to the West Coast and portions of the Intermountain West through Monday. A wintry mix will create hazardous travel across the northern Plains and Upper Midwest into early Monday. Dry, gusty winds are resulting in elevated to critical fire weather in the south/central High Plains. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

37°F

3°C

Humidity 100%
Wind Speed S 17 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Wind Chill27°F (-3°C)
Last update 05 Jan 02:50 AM PST
Extended Forecast for

3 Miles NNE San Ramon CA

  • Overnight

    Overnight: Showers likely, mainly after 4am.  Cloudy, with a low around 45. South southeast wind around 7 mph, with gusts as high as 18 mph.  Chance of precipitation is 60%.

    Low: 45 °F

    Showers
    Likely

  • Monday

    Monday: Showers.  High near 55. South southeast wind 9 to 11 mph, with gusts as high as 25 mph.  Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 55 °F

    Showers

  • Monday Night

    Monday Night: Showers likely, mainly before 10pm.  Cloudy, then gradually becoming partly cloudy, with a low around 45. East wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 60%.

    Low: 45 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: Patchy fog before 10am.  Otherwise, mostly sunny, with a high near 58. Calm wind.

    High: 58 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog.  Otherwise, mostly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Patchy Fog

  • Wednesday

    Wednesday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Patchy frost after 3am.  Otherwise, mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

Detailed Forecast

Overnight
Showers likely, mainly after 4am. Cloudy, with a low around 45. South southeast wind around 7 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.
Monday
Showers. High near 55. South southeast wind 9 to 11 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
Showers likely, mainly before 10pm. Cloudy, then gradually becoming partly cloudy, with a low around 45. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Tuesday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 58. Calm wind.
Tuesday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 44. Calm wind.
Wednesday
Mostly sunny, with a high near 56.
Wednesday Night
Mostly clear, with a low around 40.
Thursday
Sunny, with a high near 54.
Thursday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 36.
Friday
Areas of frost before 8am. Otherwise, sunny, with a high near 53.
Friday Night
Patchy frost. Otherwise, mostly clear, with a low around 35.
Saturday
Patchy frost. Otherwise, sunny, with a high near 55.
Saturday Night
Patchy frost. Otherwise, mostly clear, with a low around 36.
Sunday
Patchy frost. Otherwise, mostly sunny, with a high near 56.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE San Ramon CA
 37.8°N 121.93°W (Elev. 640 ft)
12:56 am PST Jan 5, 2026
3am PST Jan 5, 2026-6pm PST Jan 11, 2026
 
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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