Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

San Jose, San Jose International Airport (KSJC)

Lat: 37.35917°NLon: 121.92417°WElev: 59.0ft.

Partly Cloudy

61°F

16°C

Humidity	75%
Wind Speed	SSE 9 MPH
Barometer	29.67 in (1004.74 mb)
Dewpoint	53°F (12°C)
Visibility	10.00 mi
Last update	24 Dec 11:53 AM PST

More Information:

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

Extended Forecast for

2 Miles E Cupertino CA

Flood Watch December 24, 12:09pm until December 26, 10:00pm

Wind Advisory December 24, 08:00pm until December 25, 10:00am

Click here for hazard details and duration

Flood Watch

Wind Advisory

Flood Watch December 24, 12:09pm until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
This Afternoon
High: 61 °F
Severe
Thunderstorms
Tonight
Low: 50 °F
Severe
Thunderstorms
and Breezy
Christmas Day
High: 58 °F
Severe
Thunderstorms
Thursday Night
Low: 47 °F
Severe
Thunderstorms
and Breezy
then Showers
Likely
Friday
High: 57 °F
Showers
Friday Night
Low: 42 °F
Showers
Likely then
Chance
Showers
Saturday
High: 56 °F
Slight Chance
Showers then
Mostly Sunny
Saturday Night
Low: 37 °F
Mostly Clear
then Patchy
Frost

Detailed Forecast

This Afternoon

A chance of showers, with thunderstorms also possible after 4pm. Some of the storms could be severe. Mostly cloudy, with a high near 61. South wind 9 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight

Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 50. Breezy, with a south southeast wind 21 to 28 mph, with gusts as high as 55 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

Christmas Day

Showers and possibly a thunderstorm. Some of the storms could be severe. High near 58. South southwest wind 17 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night

Showers before 7pm, then showers and possibly a thunderstorm between 7pm and 10pm, then showers likely after 10pm. Some of the storms could be severe. Low around 47. Breezy, with a south southwest wind 15 to 23 mph, with gusts as high as 40 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Friday

Showers. High near 57. South wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Friday Night

Showers likely, mainly before 10pm. Mostly cloudy, with a low around 42. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A 20 percent chance of showers before 10am. Mostly sunny, with a high near 56.

Saturday Night

Patchy frost after 5am. Otherwise, mostly clear, with a low around 37.

Sunday

Patchy frost before 7am. Otherwise, sunny, with a high near 56.

Sunday Night

Patchy frost after 2am. Otherwise, mostly clear, with a low around 36.

Monday

Areas of frost. Otherwise, sunny, with a high near 59.

Monday Night

Mostly clear, with a low around 38.