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 SSE Clayton CA

Extreme Cold Warning until February 20, 09:00am
Click here for hazard details and duration
...
  •  
    Extreme Cold Warning until February 20, 09:00am

    NOW until 9:00am Fri

    Extreme Cold Warning

  • Today

    High: 45 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 36. South southeast wind around 7 mph.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 53. South southeast wind around 10 mph, with gusts as high as 23 mph.

    High: 53 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: A 30 percent chance of rain, mainly after 4am.  Partly cloudy, with a low around 44. South southeast wind 13 to 15 mph, with gusts as high as 28 mph.

    Low: 44 °F

    Chance Rain

  • Sunday

    Sunday: A 30 percent chance of rain, mainly before 10am.  Partly sunny, with a high near 60. South southeast wind around 14 mph, with gusts as high as 28 mph.

    High: 60 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A 20 percent chance of rain before 10pm.  Mostly cloudy, with a low around 47.

    Low: 47 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of rain, mainly after 4pm.  Mostly cloudy, with a high near 60.

    High: 60 °F

    Chance Rain

  • Monday Night

    Monday Night: Rain likely, mainly after 10pm.  Mostly cloudy, with a low around 53.

    Low: 53 °F

    Rain Likely

Detailed Forecast

Today
Partly sunny, with a high near 45. Southwest wind around 6 mph.
Tonight
Partly cloudy, with a low around 36. South southeast wind around 7 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 53. South southeast wind around 10 mph, with gusts as high as 23 mph.
Saturday Night
A 30 percent chance of rain, mainly after 4am. Partly cloudy, with a low around 44. South southeast wind 13 to 15 mph, with gusts as high as 28 mph.
Sunday
A 30 percent chance of rain, mainly before 10am. Partly sunny, with a high near 60. South southeast wind around 14 mph, with gusts as high as 28 mph.
Sunday Night
A 20 percent chance of rain before 10pm. Mostly cloudy, with a low around 47.
Monday
A 30 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 60.
Monday Night
Rain likely, mainly after 10pm. Mostly cloudy, with a low around 53.
Tuesday
Rain. Cloudy, with a high near 56.
Tuesday Night
Rain. Cloudy, with a low around 52.
Wednesday
Rain likely. Mostly cloudy, with a high near 58.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 49.
Thursday
A chance of rain. Partly sunny, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.9°N 121.9°W (Elev. 1814 ft)
12:32 am PST Feb 20, 2026
6am PST Feb 20, 2026-6pm PST Feb 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