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

Tracking Areas of Fire Weather, Severe Weather, and Winter Weather

Gusty winds and dry conditions will continue to bring fire weather concerns to the southern Plains through Friday. Severe thunderstorms including a few tornadoes, large hail and damaging wind gusts are expected across parts of the Midwest and lower Ohio Valley today. A Pacific storm will bring low elevation rain and thunderstorms across southern California and heavy snow through the Sierra. 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

31°F

-1°C

Humidity 99%
Wind Speed N 0 MPH
Barometer NA
Dewpoint 31°F (-1°C)
Visibility NA
Last update 19 Feb 10:05 AM PST
Extended Forecast for

Clayton CA

Extreme Cold Warning February 20, 01:00am until February 20, 09:00am
Click here for hazard details and duration
Extreme Cold Warning

  • Today

    Today: A 30 percent chance of rain, mainly before 1pm. Mostly sunny, with a high near 48. Breezy, with a west northwest wind around 23 mph, with gusts as high as 39 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Chance Rain
    and Breezy

  • Tonight

    Tonight: Patchy frost after midnight. Otherwise, mostly clear, with a low around 34. West wind 6 to 14 mph becoming south southwest after midnight. Winds could gust as high as 25 mph.

    Low: 34 °F

    Mostly Clear
    then Patchy
    Frost

  • Friday

    Friday: Partly sunny, with a high near 49. Southeast wind around 5 mph becoming light and variable in the afternoon.

    High: 49 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 37. East wind 3 to 6 mph.

    Low: 37 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 55. South southeast wind 8 to 11 mph, with gusts as high as 22 mph.

    High: 55 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A 40 percent chance of rain. Partly sunny, with a high near 61.

    High: 61 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A chance of rain. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Chance Rain

  • Monday

    Monday: Rain likely, mainly after 4pm. Mostly cloudy, with a high near 62.

    High: 62 °F

    Rain Likely

Detailed Forecast

Today
A 30 percent chance of rain, mainly before 1pm. Mostly sunny, with a high near 48. Breezy, with a west northwest wind around 23 mph, with gusts as high as 39 mph. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Patchy frost after midnight. Otherwise, mostly clear, with a low around 34. West wind 6 to 14 mph becoming south southwest after midnight. Winds could gust as high as 25 mph.
Friday
Partly sunny, with a high near 49. Southeast wind around 5 mph becoming light and variable in the afternoon.
Friday Night
Partly cloudy, with a low around 37. East wind 3 to 6 mph.
Saturday
Partly sunny, with a high near 55. South southeast wind 8 to 11 mph, with gusts as high as 22 mph.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 46.
Sunday
A 40 percent chance of rain. Partly sunny, with a high near 61.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 51.
Monday
Rain likely, mainly after 4pm. Mostly cloudy, with a high near 62.
Monday Night
Rain. Mostly cloudy, with a low around 54.
Tuesday
Rain. Mostly cloudy, with a high near 59.
Tuesday Night
Rain. Mostly cloudy, with a low around 52.
Wednesday
Rain likely. Mostly cloudy, with a high near 59.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
Last Update:
1:27 am PST Feb 19, 2026
Forecast Valid:
10am PST Feb 19, 2026-6pm PST Feb 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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