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

An Alberta clipper will bring lake effect snow downwind of the Great Lakes, with the highest snow totals downwind of Lakes Erie and Ontario. Snow squalls may impact New Year's Eve travel during the evening and overnight hours across parts of the Great Lakes, Ohio Valley, and Northeast. Heavy rain will bring a flash flooding threat for southern California on 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.

56°F

13°C

Humidity	16%
Wind Speed	E 11 MPH
Barometer	NA
Dewpoint	10°F (-12°C)
Visibility	NA
Last update	30 Dec 08:40 PM PST

More Information:

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

Extended Forecast for

4 Miles SSE Clayton CA

Tonight
Low: 51 °F
Mostly Cloudy
then Slight
Chance Rain
Wednesday
High: 52 °F⇓
Rain
Wednesday Night
Low: 46 °F⇑
Rain
New Year's Day
High: 54 °F
Rain
Thursday Night
Low: 52 °F
Rain
Friday
High: 56 °F
Rain and
Breezy
Friday Night
Low: 48 °F
Rain
Saturday
High: 52 °F
Rain
Saturday Night
Low: 46 °F
Rain Likely

Detailed Forecast

Tonight

A 10 percent chance of rain after 4am. Mostly cloudy, with a steady temperature around 51. East northeast wind around 7 mph.

Wednesday

Rain, mainly after 10am. Temperature falling to around 45 by 2pm. East wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night

Rain. Temperature rising to around 50 by 5am. East wind around 9 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 54. South wind 11 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

Thursday Night

Rain. Low around 52. South wind 14 to 16 mph, with gusts as high as 32 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Friday

Rain. High near 56. Breezy. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night

Rain. Low around 48. Chance of precipitation is 90%.

Saturday

Rain. Mostly cloudy, with a high near 52.

Saturday Night

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

Sunday

Rain likely, mainly before 10am. Mostly cloudy, with a high near 51.

Sunday Night

Rain likely. Mostly cloudy, with a low around 45.