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

56°F

13°C

Humidity 28%
Wind Speed NNE 6 MPH
Barometer NA
Dewpoint 24°F (-4°C)
Visibility NA
Last update 20 Jan 12:35 AM PST
Extended Forecast for

2 Miles SSE Clayton CA

  • Overnight

    Overnight: Partly cloudy, with a low around 42. East wind 3 to 5 mph.

    Low: 42 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 59. East wind around 6 mph.

    High: 59 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 48. Calm wind.

    Low: 48 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 60. Light north northeast wind.

    High: 60 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 48. Light southwest wind.

    Low: 48 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Friday Night

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

    Low: 44 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 42. East wind 3 to 5 mph.
Tuesday
Partly sunny, with a high near 59. East wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 48. Calm wind.
Wednesday
Mostly cloudy, with a high near 60. Light north northeast wind.
Wednesday Night
Mostly cloudy, with a low around 48. Light southwest wind.
Thursday
Mostly sunny, with a high near 62.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 61.
Friday Night
Mostly clear, with a low around 44.
Saturday
Sunny, with a high near 60.
Saturday Night
Partly cloudy, with a low around 44.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Mostly cloudy, with a low around 45.
Monday
Partly sunny, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Clayton CA
 37.92°N 121.93°W (Elev. 600 ft)
12:26 am PST Jan 20, 2026
12am PST Jan 20, 2026-6pm PST Jan 26, 2026
 
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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