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

Extreme Cold Warning in effect from February 20, 01:00 AM PST until February 20, 09:00 AM PST

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

31°F

-1°C

Humidity	99%
Wind Speed	N 0 MPH
Barometer	NA
Dewpoint	31°F (-1°C)
Visibility	NA
Last update	19 Feb 09:50 AM PST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

4 Miles SSE 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
High: 40 °F
Chance Snow
and Breezy
Tonight
Low: 31 °F
Mostly Clear
Friday
High: 44 °F
Partly Sunny
Friday Night
Low: 37 °F
Partly Cloudy
Saturday
High: 51 °F
Partly Sunny
Saturday Night
Low: 45 °F
Slight Chance
Rain
Sunday
High: 56 °F
Chance Rain
Sunday Night
Low: 50 °F
Chance Rain
Monday
High: 58 °F
Rain Likely

Detailed Forecast

Today

A 30 percent chance of snow, mainly before 1pm. Mostly sunny, with a high near 40. Breezy, with a west northwest wind 25 to 28 mph, with gusts as high as 45 mph. Little or no snow accumulation expected.

Tonight

Mostly clear, with a low around 31. West northwest wind 9 to 18 mph, with gusts as high as 33 mph.

Friday

Partly sunny, with a high near 44. Southeast wind 5 to 7 mph becoming light and variable in the afternoon.

Friday Night

Partly cloudy, with a low around 37. East southeast wind 6 to 9 mph.

Saturday

Partly sunny, with a high near 51. South southeast wind 13 to 15 mph, with gusts as high as 26 mph.

Saturday Night

A 20 percent chance of rain after 10pm. Mostly cloudy, with a low around 45.

Sunday

A 40 percent chance of rain. Partly sunny, with a high near 56.