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

Heavy Rain and Mountain Snow Lingers in California; Winter Storm Impacting the Great Lakes and Northeast U.S.

An atmospheric river will wind down through today across California with lingering heavy rainfall, heavy mountain snow, and gusty winds. A wintry mix of freezing rain, sleet, and snow will cause hazardous travel conditions for the Great Lakes into the northern Mid-Atlantic and southern New England today through Saturday morning. Areas of tree damage and power outages are possible. 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 WNW 10 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Wind Chill30°F (-1°C)
Last update 26 Dec 07:05 PM PST
Extended Forecast for

3 Miles S Clayton CA

  • Tonight

    Tonight: Partly cloudy, with a low around 40. West southwest wind around 9 mph, with gusts as high as 18 mph.

    Low: 40 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 46. West wind around 7 mph becoming north in the afternoon.

    High: 46 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. North northwest wind around 6 mph.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 46. North northeast wind around 8 mph.

    High: 46 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 37. Northeast wind around 6 mph.

    Low: 37 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 40. West southwest wind around 9 mph, with gusts as high as 18 mph.
Saturday
Mostly sunny, with a high near 46. West wind around 7 mph becoming north in the afternoon.
Saturday Night
Partly cloudy, with a low around 38. North northwest wind around 6 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 46. North northeast wind around 8 mph.
Sunday Night
Clear, with a low around 37. Northeast wind around 6 mph.
Monday
Sunny, with a high near 48.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Sunny, with a high near 49.
Tuesday Night
Mostly clear, with a low around 39.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 42.
New Year's Day
A chance of showers. Mostly cloudy, with a high near 49.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 45.
Friday
A chance of showers. Partly sunny, with a high near 49.
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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:
12:27 pm PST Dec 26, 2025
Forecast Valid:
7pm PST Dec 26, 2025-6pm PST Jan 2, 2026
 
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