Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

55°F

13°C

Humidity 25%
Wind Speed N 12 MPH
Barometer NA
Dewpoint 19°F (-7°C)
Visibility NA
Last update 19 Jan 05:40 AM PST
Extended Forecast for

4 Miles SSE Clayton CA

  • M.L.King Day

    M.L.King Day: Sunny, with a temperature falling to around 54 by 5pm. North northeast wind around 6 mph.

    High: 59 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 47. East northeast wind 3 to 6 mph.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 57. Northeast wind around 8 mph.

    High: 57 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45. Northeast wind 3 to 5 mph.

    Low: 45 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 55. North northeast wind around 6 mph.

    High: 55 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

Detailed Forecast

M.L.King Day
Sunny, with a temperature falling to around 54 by 5pm. North northeast wind around 6 mph.
Tonight
Mostly clear, with a low around 47. East northeast wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 57. Northeast wind around 8 mph.
Tuesday Night
Partly cloudy, with a low around 45. Northeast wind 3 to 5 mph.
Wednesday
Partly sunny, with a high near 55. North northeast wind around 6 mph.
Wednesday Night
Mostly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 57.
Thursday Night
Mostly clear, with a low around 44.
Friday
Mostly sunny, with a high near 56.
Friday Night
Mostly clear, with a low around 43.
Saturday
Mostly sunny, with a high near 55.
Saturday Night
Partly cloudy, with a low around 43.
Sunday
Mostly sunny, with a high near 54.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
12:26 am PST Jan 19, 2026
5am PST Jan 19, 2026-6pm PST Jan 25, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database