Critical Fire Weather in the Southern High Plains; Heavy Snow in the Great Lakes and Northeast U.S.

Gusty winds and low relative humidity will bring elevated to critical fire weather conditions to the southern High Plains through the weekend. A winter storm will track across the Great Lakes and Northeast U.S. into Saturday with areas of wintry mix and heavy snow from northern New York through southern Maine. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

28°F

-2°C

Humidity 99%
Wind Speed N 0 MPH
Barometer NA
Dewpoint 28°F (-2°C)
Visibility NA
Last update 20 Feb 03:25 AM PST
Extended Forecast for

4 Miles ENE Danville CA

Cold Weather Advisory February 21, 04:46am until February 21, 09:00am
Click here for hazard details and duration
...
  •  
    Cold Weather Advisory February 21, 04:46am until February 21, 09:00am

    NOW until 9:00am Sat

    Cold Weather Advisory

  • Today

    High: 58 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Partly cloudy, with a low around 40. South southeast wind around 9 mph, with gusts as high as 20 mph.

    Low: 40 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 64. South wind around 7 mph.

    High: 64 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 42. Light and variable wind.

    Low: 42 °F

    Mostly Cloudy

  • Monday

    Monday: A 10 percent chance of rain after 4pm.  Partly sunny, with a high near 65. Light east northeast wind.

    High: 65 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: Rain likely, mainly after 4am.  Mostly cloudy, with a low around 51. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 51 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain.  High near 61. Chance of precipitation is 80%.

    High: 61 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly before 10pm.  Cloudy, with a low around 50.

    Low: 50 °F

    Rain

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 58. South wind 5 to 10 mph, with gusts as high as 22 mph.
Tonight
Partly cloudy, with a low around 40. South southeast wind around 9 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 64. South wind around 7 mph.
Sunday Night
Mostly cloudy, with a low around 42. Light and variable wind.
Monday
A 10 percent chance of rain after 4pm. Partly sunny, with a high near 65. Light east northeast wind.
Monday Night
Rain likely, mainly after 4am. Mostly cloudy, with a low around 51. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
Rain. High near 61. Chance of precipitation is 80%.
Tuesday Night
Rain, mainly before 10pm. Cloudy, with a low around 50.
Wednesday
A chance of rain. Mostly cloudy, with a high near 63.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 47.
Thursday
A slight chance of rain. Partly sunny, with a high near 66.
Thursday Night
A slight chance of rain. Mostly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 68.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ENE Danville CA
 37.85°N 121.94°W (Elev. 1362 ft)
12:26 am PST Feb 21, 2026
4am PST Feb 21, 2026-6pm PST Feb 27, 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