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

44°F

7°C

Humidity 100%
Wind Speed S 13 MPH
Barometer NA
Dewpoint 44°F (7°C)
Visibility NA
Wind Chill38°F (3°C)
Last update 02 Jan 04:05 AM PST
Extended Forecast for

3 Miles S Clayton CA

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

  • Today

    Today: Rain after 4pm. Steady temperature around 50. South wind 16 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 50 °F

    Partly Sunny
    then Rain

  • Tonight

    Tonight: Rain. Low around 50. Windy, with a south southeast wind 21 to 31 mph, with gusts as high as 50 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 50 °F

    Rain and
    Windy

  • Saturday

    Saturday: Rain. High near 52. South wind around 21 mph, with gusts as high as 38 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 49. South wind around 17 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 49 °F

    Rain

  • Sunday

    Sunday: Rain. High near 52. South southwest wind 13 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 52 °F

    Rain

  • Sunday Night

    Sunday Night: Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 46 °F

    Rain Likely

  • Monday

    Monday: Rain likely. Mostly cloudy, with a high near 50. Chance of precipitation is 70%.

    High: 50 °F

    Rain Likely

  • Monday Night

    Monday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Rain Likely

  • Tuesday

    Tuesday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

Detailed Forecast

Today
Rain after 4pm. Steady temperature around 50. South wind 16 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain. Low around 50. Windy, with a south southeast wind 21 to 31 mph, with gusts as high as 50 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Rain. High near 52. South wind around 21 mph, with gusts as high as 38 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Rain. Low around 49. South wind around 17 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Rain. High near 52. South southwest wind 13 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain likely. Mostly cloudy, with a high near 50. Chance of precipitation is 70%.
Monday Night
Rain likely, mainly before 10pm. Mostly cloudy, with a low around 44.
Tuesday
Partly sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 43.
Wednesday
A chance of rain. Partly sunny, with a high near 50.
Wednesday Night
A chance of rain. Partly cloudy, with a low around 39.
Thursday
A slight chance of rain. Sunny, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Clayton CA
 37.9°N 121.92°W (Elev. 1900 ft)
Last Update:
2:04 am PST Jan 2, 2026
Forecast Valid:
4am 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