Strong Storm System Brings Heavy Mountain Snow to the Sierra Nevada and Critical Fire Weather Conditions to the Plains

A Pacific storm system will continue to bring low elevation rain and mountain snow to much of the West through Wednesday, with heavy mountain snow expected in the higher elevations of the Sierra Nevada. This system will also bring strong winds to the Intermountain West, Rockies, and Plains, which will create Critical fire weather conditions for the High Plains. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

38°F

3°C

Humidity	100%
Wind Speed	WSW 10 MPH
Barometer	NA
Dewpoint	38°F (3°C)
Visibility	NA
Wind Chill	31°F (-1°C)
Last update	21 Apr 10:00 PM PDT

More Information:

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

Extended Forecast for

4 Miles SSE Clayton CA

Overnight
Low: 41 °F
Chance
Showers
Wednesday
High: 50 °F
Rain Likely
Wednesday Night
Low: 44 °F
Mostly Clear
Thursday
High: 59 °F
Sunny
Thursday Night
Low: 47 °F
Partly Cloudy
Friday
High: 57 °F
Partly Sunny
Friday Night
Low: 48 °F
Mostly Cloudy
Saturday
High: 52 °F
Partly Sunny
Saturday Night
Low: 48 °F
Partly Cloudy

Detailed Forecast

Overnight

A chance of rain, mainly between 3am and 5am, then a chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 41. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday

Rain and thunderstorms likely before 3pm, then a slight chance of rain between 3pm and 4pm. Partly sunny, with a high near 50. South wind 7 to 10 mph becoming north in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

Mostly clear, with a low around 44. Northwest wind 7 to 9 mph.

Thursday

Sunny, with a high near 59. West northwest wind around 7 mph.

Thursday Night

Partly cloudy, with a low around 47. Southwest wind around 11 mph, with gusts as high as 21 mph.

Friday

Partly sunny, with a high near 57.

Friday Night

Mostly cloudy, with a low around 48.

Saturday

Partly sunny, with a high near 52.