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

43°F

6°C

Humidity 48%
Wind Speed N 13 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Wind Chill36°F (2°C)
Last update 03 Dec 02:05 PM PST
Extended Forecast for

Clayton CA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 56. North northeast wind around 11 mph, with gusts as high as 18 mph.

    High: 56 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 40. East northeast wind 3 to 8 mph. Winds could gust as high as 20 mph.

    Low: 40 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 53. Northeast wind 5 to 8 mph.

    High: 53 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 45. East wind around 5 mph becoming calm in the evening.

    Low: 45 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 58. Calm wind becoming north northeast around 5 mph in the morning.

    High: 58 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 56. North northeast wind around 11 mph, with gusts as high as 18 mph.
Tonight
Partly cloudy, with a low around 40. East northeast wind 3 to 8 mph. Winds could gust as high as 20 mph.
Thursday
Sunny, with a high near 53. Northeast wind 5 to 8 mph.
Thursday Night
Mostly clear, with a low around 45. East wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 58. Calm wind becoming north northeast around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 45.
Saturday
Sunny, with a high near 58.
Saturday Night
Partly cloudy, with a low around 47.
Sunday
Mostly sunny, with a high near 58.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Mostly sunny, with a high near 59.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
Last Update:
12:26 pm PST Dec 3, 2025
Forecast Valid:
2pm PST Dec 3, 2025-6pm PST Dec 9, 2025
 
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Additional Resources

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