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.

57°F

14°C

Humidity	20%
Wind Speed	ESE 11 MPH
Barometer	NA
Dewpoint	17°F (-8°C)
Visibility	NA
Last update	31 Dec 03:05 AM PST

More Information:

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

Extended Forecast for

4 Miles S Clayton CA

Overnight
Low: 52 °F
Chance Rain
Wednesday
High: 52 °F⇓
Rain Likely
Wednesday Night
Low: 46 °F⇑
Rain
New Year's Day
High: 52 °F
Rain and
Breezy
Thursday Night
Low: 50 °F
Rain Likely
then Chance
Rain
Friday
High: 55 °F
Rain and
Breezy
Friday Night
Low: 50 °F
Showers and
Breezy
Saturday
High: 54 °F
Rain
Saturday Night
Low: 48 °F
Rain

Detailed Forecast

Overnight

A 30 percent chance of rain after 4am. Mostly cloudy, with a steady temperature around 52. East wind around 9 mph.

Wednesday

Rain likely, mainly after 10am. Cloudy, with a temperature falling to around 46 by 2pm. Southeast wind around 8 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night

Rain. Temperature falling to near 46 by midnight, then rising to around 50 during the remainder of the night. East wind 13 to 15 mph, with gusts as high as 28 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 52. Breezy, with a south wind 20 to 23 mph, with gusts as high as 40 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 wind 11 to 20 mph, with gusts as high as 32 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 55. Breezy. 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%.

Saturday

Rain. Cloudy, with a high near 54.

Saturday Night

Rain. 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.