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

Heavy Snow in the Northwest; Wintry Mix from the Great Lakes to Northeast

Two cold fronts will pass through the Northwest U.S. this week with the main impact being heavy mountain snow across the Cascades, and northern Rockies. A quick moving storm system will bring mixed precipitation including some freezing rain to the Upper Midwest and Great Lakes today then the Northeast U.S. tonight into Wednesday. Read More >

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 89%
Wind Speed SW 3 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 06 Jan 04:50 PM PST
Extended Forecast for

4 Miles ENE Danville CA

  • Tonight

    Tonight: Patchy fog between 9pm and 11pm. Otherwise, mostly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Cloudy, then gradually becoming mostly sunny, with a high near 56. West northwest wind 6 to 9 mph, with gusts as high as 18 mph.

    High: 56 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 37. West wind 8 to 10 mph, with gusts as high as 22 mph.

    Low: 37 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 52. North northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 52 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 34. North wind around 6 mph.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Friday Night

    Friday Night: Patchy frost between 11pm and 4am. Otherwise, partly cloudy, with a low around 33.

    Low: 33 °F

    Patchy Frost

  • Saturday

    Saturday: Areas of frost between 7am and 9am. Otherwise, partly sunny, with a high near 53.

    High: 53 °F

    Areas Frost
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Patchy fog between 9pm and 11pm. Otherwise, mostly cloudy, with a low around 44. Calm wind.
Wednesday
Cloudy, then gradually becoming mostly sunny, with a high near 56. West northwest wind 6 to 9 mph, with gusts as high as 18 mph.
Wednesday Night
Mostly clear, with a low around 37. West wind 8 to 10 mph, with gusts as high as 22 mph.
Thursday
Sunny, with a high near 52. North northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around 34. North wind around 6 mph.
Friday
Sunny, with a high near 52.
Friday Night
Patchy frost between 11pm and 4am. Otherwise, partly cloudy, with a low around 33.
Saturday
Areas of frost between 7am and 9am. Otherwise, partly sunny, with a high near 53.
Saturday Night
Mostly cloudy, with a low around 36.
Sunday
Partly sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 37.
Monday
Sunny, with a high near 58.
Monday Night
Mostly clear, with a low around 38.
Tuesday
Sunny, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ENE Danville CA
 37.85°N 121.94°W (Elev. 1362 ft)
Last Update:
12:26 pm PST Jan 6, 2026
Forecast Valid:
5pm PST Jan 6, 2026-6pm PST Jan 13, 2026
 
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Additional Resources

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