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

Lake Effect Snow through Saturday: A Series of Storms Impact the West

Lake effect snow showers will continue through Saturday downwind of Lakes Erie, Ontario and the eastern portion of Lake Superior. A series of storm systems will continue to impact California and the Pacific Northwest through the weekend and into next week, bringing widespread rainfall, mountain snowfall, and gusty winds. Coastal flooding is expected in northern California. Read More >

Hazardous Weather Conditions

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

45°F

7°C

Humidity 100%
Wind Speed S 13 MPH
Barometer NA
Dewpoint 45°F (7°C)
Visibility NA
Wind Chill39°F (4°C)
Last update 01 Jan 11:50 PM PST
Extended Forecast for

3 Miles NNE San Ramon CA

Wind Advisory January 2, 01:00pm until January 3, 01:00pm
Click here for hazard details and duration
Wind Advisory

  • Overnight

    Overnight: Mostly cloudy, with a low around 47. East southeast wind 3 to 5 mph.

    Low: 47 °F

    Mostly Cloudy

  • Friday

    Friday: Rain likely after 4pm. Mostly cloudy, with a high near 60. Southeast wind 5 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 60 °F

    Partly Sunny
    then Rain
    Likely

  • Friday Night

    Friday Night: Rain. Steady temperature around 55. South wind 8 to 10 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 55 °F

    Rain

  • Saturday

    Saturday: Rain before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. High near 59. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 59 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm, then rain after 7pm. Low around 50. South wind 7 to 9 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Showers

  • Sunday

    Sunday: Rain. High near 55. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 55 °F

    Rain

  • Sunday Night

    Sunday Night: Rain. Low around 46. Chance of precipitation is 80%.

    Low: 46 °F

    Rain

  • Monday

    Monday: Rain likely. Cloudy, with a high near 54.

    High: 54 °F

    Rain Likely

  • Monday Night

    Monday Night: A chance of rain, mainly before 4am. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 43.

    Low: 43 °F

    Chance Rain
    and Patchy
    Fog

Detailed Forecast

Overnight
Mostly cloudy, with a low around 47. East southeast wind 3 to 5 mph.
Friday
Rain likely after 4pm. Mostly cloudy, with a high near 60. Southeast wind 5 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain. Steady temperature around 55. South wind 8 to 10 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Rain before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. High near 59. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers likely and possibly a thunderstorm, then rain after 7pm. Low around 50. South wind 7 to 9 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Rain. High near 55. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Rain. Low around 46. Chance of precipitation is 80%.
Monday
Rain likely. Cloudy, with a high near 54.
Monday Night
A chance of rain, mainly before 4am. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 43.
Tuesday
A slight chance of rain before 10am. Patchy fog before 10am. Otherwise, partly sunny, with a high near 56.
Tuesday Night
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 41.
Wednesday
A chance of rain. Mostly cloudy, with a high near 54.
Wednesday Night
A chance of rain. Partly cloudy, with a low around 37.
Thursday
A chance of rain. Sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE San Ramon CA
 37.8°N 121.93°W (Elev. 640 ft)
Last Update:
10:46 pm PST Jan 1, 2026
Forecast Valid:
12am PST Jan 2, 2026-6pm PST Jan 8, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation