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

Heavy Snow in the Cascades and Northern Rockies; Wintry Mix in the Northeast; High Winds in Southern California

Two more cold fronts will pass through the Northwest U.S. this week with heavy mountain snow continuing across the Cascades, and northern Rockies. A quick moving storm system will bring mixed precipitation including some freezing rain across the Northeast U.S. today. High winds could blow down trees and power lines in the mountains of southern California this evening through Thursday. Read More >

Hazardous Weather Conditions

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 82%
Wind Speed W 3 MPH
Barometer NA
Dewpoint 38°F (3°C)
Visibility NA
Last update 07 Jan 12:50 PM PST
Extended Forecast for

4 Miles ENE Danville CA

Extreme Cold Watch January 9, 01:00am until January 9, 09:00am
Click here for hazard details and duration
Extreme Cold Watch

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 56. West northwest wind around 10 mph, with gusts as high as 20 mph.

    High: 56 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 38. West northwest wind around 10 mph, with gusts as high as 24 mph.

    Low: 38 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 52. North wind 7 to 10 mph, with gusts as high as 21 mph.

    High: 52 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 34. North wind 5 to 7 mph.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 51. Northeast wind around 7 mph.

    High: 51 °F

    Sunny

  • Friday Night

    Friday Night: Widespread frost, mainly after 4am. Otherwise, mostly clear, with a low around 33.

    Low: 33 °F

    Frost

  • Saturday

    Saturday: Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 54.

    High: 54 °F

    Frost then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 55.

    High: 55 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 56. West northwest wind around 10 mph, with gusts as high as 20 mph.
Tonight
Partly cloudy, with a low around 38. West northwest wind around 10 mph, with gusts as high as 24 mph.
Thursday
Sunny, with a high near 52. North wind 7 to 10 mph, with gusts as high as 21 mph.
Thursday Night
Mostly clear, with a low around 34. North wind 5 to 7 mph.
Friday
Sunny, with a high near 51. Northeast wind around 7 mph.
Friday Night
Widespread frost, mainly after 4am. Otherwise, mostly clear, with a low around 33.
Saturday
Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 54.
Saturday Night
Mostly cloudy, with a low around 35.
Sunday
Partly sunny, with a high near 55.
Sunday Night
Patchy frost after 3am. Otherwise, partly cloudy, with a low around 36.
Monday
Patchy frost. Otherwise, sunny, with a high near 57.
Monday Night
Mostly clear, with a low around 38.
Tuesday
Mostly sunny, with a high near 60.
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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 7, 2026
Forecast Valid:
1pm PST Jan 7, 2026-6pm PST Jan 13, 2026
 
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