Snow Squalls May Impact New Year's Eve Travel from the Great Lakes to the Mid-Atlantic; Heavy Rain Returns to California

Lake effect snow will continue through Friday bringing significant snowfall to areas east to southeast of the Great Lakes. Snow squalls may impact New Year's Eve travel this evening and overnight across parts of the Great Lakes, Ohio Valley, Mid-Atlantic, and Upstate New York. Heavy rain will bring another flash flooding threat for southern California New Year's Eve into New Year's Day. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

53°F

12°C

Humidity	36%
Wind Speed	SSE 9 MPH
Barometer	NA
Dewpoint	27°F (-3°C)
Visibility	NA
Last update	31 Dec 06:20 AM PST

More Information:

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

Extended Forecast for

3 Miles SSE Clayton CA

Today
High: 50 °F⇓
Rain Likely
Tonight
Low: 46 °F⇑
Rain
New Year's Day
High: 53 °F
Rain and
Breezy
Thursday Night
Low: 50 °F
Rain Likely
then Chance
Rain
Friday
High: 54 °F
Rain and
Breezy
Friday Night
Low: 50 °F
Showers and
Breezy
Saturday
High: 53 °F
Rain
Saturday Night
Low: 48 °F
Rain
Sunday
High: 51 °F
Rain Likely

Detailed Forecast

Today

Rain likely, mainly after 10am. Cloudy, with a temperature falling to around 45 by 5pm. East southeast wind around 7 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Tonight

Rain. Temperature rising to around 49 by 5am. East southeast wind 9 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

New Year's Day

Rain. High near 53. Breezy, with a south wind 20 to 23 mph, with gusts as high as 39 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night

Rain likely, mainly before 10pm. Mostly cloudy, with a low around 50. South southeast wind 16 to 21 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Friday

Rain, mainly after 10am. High near 54. Breezy, with a south southeast wind 18 to 23 mph, with gusts as high as 34 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Friday Night

Rain before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then rain and possibly a thunderstorm after 4am. Low around 50. Breezy. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday

Rain. High near 53. Chance of precipitation is 90%.

Saturday Night

Rain. Mostly cloudy, with a low around 48.

Sunday

Rain likely. Mostly cloudy, with a high near 51.

Sunday Night

Rain likely. Mostly cloudy, with a low around 46.

Monday

Rain likely. Mostly cloudy, with a high near 50.

Monday Night

Rain likely. Mostly cloudy, with a low around 46.