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

2 Miles S Clayton CA

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

    NOW until 9:00am Fri

    Extreme Cold Warning

  • Overnight

    Low: 35 °F

    Areas Frost

  • Friday

    Friday: Partly sunny, with a high near 51. South wind around 5 mph becoming west in the afternoon.

    High: 51 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 38. Southeast wind around 6 mph.

    Low: 38 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 58. South southeast wind 8 to 10 mph, with gusts as high as 22 mph.

    High: 58 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of rain, mainly after 4am.  Partly cloudy, with a low around 45. South southeast wind 11 to 14 mph, with gusts as high as 26 mph.

    Low: 45 °F

    Chance Rain

  • Sunday

    Sunday: A 30 percent chance of rain, mainly before 10am.  Partly sunny, with a high near 66.

    High: 66 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A 20 percent chance of rain before 4am.  Mostly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    Rain

  • Monday

    Monday: A chance of rain, mainly after 4pm.  Mostly cloudy, with a high near 65.

    High: 65 °F

    Chance Rain

Detailed Forecast

Overnight
Areas of frost before 5am. Otherwise, partly cloudy, with a low around 35. South southwest wind around 6 mph.
Friday
Partly sunny, with a high near 51. South wind around 5 mph becoming west in the afternoon.
Friday Night
Partly cloudy, with a low around 38. Southeast wind around 6 mph.
Saturday
Mostly sunny, with a high near 58. South southeast wind 8 to 10 mph, with gusts as high as 22 mph.
Saturday Night
A 30 percent chance of rain, mainly after 4am. Partly cloudy, with a low around 45. South southeast wind 11 to 14 mph, with gusts as high as 26 mph.
Sunday
A 30 percent chance of rain, mainly before 10am. Partly sunny, with a high near 66.
Sunday Night
A 20 percent chance of rain before 4am. Mostly cloudy, with a low around 48.
Monday
A chance of rain, mainly after 4pm. Mostly cloudy, with a high near 65.
Monday Night
Rain likely, mainly after 10pm. Cloudy, with a low around 55.
Tuesday
Rain. Cloudy, with a high near 60.
Tuesday Night
Rain. Cloudy, with a low around 52.
Wednesday
Rain likely. Mostly cloudy, with a high near 63.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 51.
Thursday
A chance of rain. Partly sunny, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Clayton CA
 37.92°N 121.93°W (Elev. 600 ft)
12:32 am PST Feb 20, 2026
4am 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