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

Extremely Critical Fire Weather in the Central Plains; Active Pattern in the West

Gusty to high winds and low relative humidity will bring critical to extremely critical fire weather conditions to the central and southern Plains today into Wednesday. Use caution with any potential ignition sources. Two Pacific storms will impact the western U.S. into Wednesday with gusty winds, low elevation rain and heavy mountain snow. 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

32°F

0°C

Humidity 100%
Wind Speed SW 11 MPH
Barometer NA
Dewpoint 32°F (0°C)
Visibility NA
Wind Chill23°F (-5°C)
Last update 17 Feb 01:50 PM PST
Extended Forecast for

4 Miles S Clayton CA

Flood Advisory February 17, 02:02pm until February 17, 03:00pm
Click here for hazard details and duration
Flood Advisory
  •  
    Flood Advisory February 17, 02:02pm until February 17, 03:00pm

    NOW until 3:00pm Tue

    Flood Advisory

  • This Afternoon

    High: 37 °F

    Rain/Snow
    Likely and
    Windy

  • Tonight

    Tonight: Snow likely before 2am, then a slight chance of snow after 3am. Some thunder is also possible. Mostly cloudy, with a steady temperature around 35. West northwest wind 11 to 17 mph, with gusts as high as 39 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    Low: 35 °F

    Snow Showers
    Likely then
    Slight Chance
    Snow

  • Wednesday

    Wednesday: A 40 percent chance of snow before 4pm. Partly sunny, with a high near 40. West southwest wind around 11 mph, with gusts as high as 28 mph. New snow accumulation of less than one inch possible.

    High: 40 °F

    Chance Snow

  • Wednesday Night

    Wednesday Night: Snow before 1am, then rain and snow. Low around 36. South wind around 13 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 36 °F

    Snow then
    Rain/Snow

  • Thursday

    Thursday: Rain and snow, becoming all snow after 7am. High near 41. Breezy, with a southwest wind 11 to 16 mph becoming west northwest 18 to 23 mph in the morning. Winds could gust as high as 44 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 41 °F

    Breezy.
    Rain/Snow
    then Chance
    Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow before 10pm. Partly cloudy, with a low around 34. Little or no snow accumulation expected.

    Low: 34 °F

    Chance Snow
    then Mostly
    Clear

  • Friday

    Friday: A slight chance of snow between 10am and 4pm. Mostly sunny, with a high near 45. Chance of precipitation is 20%.

    High: 45 °F

    Slight Chance
    Snow

  • Friday Night

    Friday Night: A chance of rain and snow, mainly between 10pm and 4am. Partly cloudy, with a low around 37.

    Low: 37 °F

    Chance
    Rain/Snow

Detailed Forecast

This Afternoon
Rain and snow showers likely, mainly after 4pm. Some thunder is also possible. Mostly cloudy, with a steady temperature around 37. Windy, with a west southwest wind 25 to 30 mph, with gusts as high as 39 mph. Chance of precipitation is 60%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Snow likely before 2am, then a slight chance of snow after 3am. Some thunder is also possible. Mostly cloudy, with a steady temperature around 35. West northwest wind 11 to 17 mph, with gusts as high as 39 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Wednesday
A 40 percent chance of snow before 4pm. Partly sunny, with a high near 40. West southwest wind around 11 mph, with gusts as high as 28 mph. New snow accumulation of less than one inch possible.
Wednesday Night
Snow before 1am, then rain and snow. Low around 36. South wind around 13 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Thursday
Rain and snow, becoming all snow after 7am. High near 41. Breezy, with a southwest wind 11 to 16 mph becoming west northwest 18 to 23 mph in the morning. Winds could gust as high as 44 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Thursday Night
A 30 percent chance of snow before 10pm. Partly cloudy, with a low around 34. Little or no snow accumulation expected.
Friday
A slight chance of snow between 10am and 4pm. Mostly sunny, with a high near 45. Chance of precipitation is 20%.
Friday Night
A chance of rain and snow, mainly between 10pm and 4am. Partly cloudy, with a low around 37.
Saturday
A slight chance of rain and snow before 10am, then a chance of rain. Partly sunny, with a high near 50.
Saturday Night
Rain likely, mainly after 10pm. Mostly cloudy, with a low around 46. Breezy.
Sunday
Rain likely. Mostly cloudy, with a high near 54. Breezy.
Sunday Night
Rain. Cloudy, with a low around 51. Breezy.
Monday
Rain. Cloudy, with a high near 55. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
Last Update:
1:24 pm PST Feb 17, 2026
Forecast Valid:
2pm PST Feb 17, 2026-6pm PST Feb 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation