National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

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.

Overcast

61°F

16°C

Humidity 72%
Wind Speed SE 16 MPH
Barometer 29.61 in (1002.71 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 24 Dec 06:35 PM PST
Extended Forecast for

2 Miles E Cupertino CA

Flood Watch December 24, 06:51pm 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, 06:51pm until December 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Tonight

    Low: 50 °F

    Severe
    Thunderstorms
    and Breezy

  • Christmas Day

    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.

    High: 58 °F

    Severe
    Thunderstorms

  • Thursday Night

    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.

    Low: 47 °F

    Severe
    Thunderstorms
    and Breezy
    then Showers
    Likely

  • Friday

    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.

    High: 57 °F

    Showers

  • Friday Night

    Friday Night: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 42. South southeast wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday

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

    High: 56 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Saturday Night

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

    Low: 37 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

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

    High: 56 °F

    Patchy Frost
    then Sunny

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 50. Breezy, with a south southeast wind 17 to 22 mph increasing to 23 to 28 mph after midnight. Winds could gust 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. South southeast wind around 6 mph. 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 before 8am. Otherwise, sunny, with a high near 59.
Monday Night
Mostly clear, with a low around 38.
Tuesday
Sunny, with a high near 61.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 62.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E Cupertino CA
 37.31°N 122.01°W (Elev. 197 ft)
Last Update:
4:56 pm PST Dec 24, 2025
Forecast Valid:
6pm PST Dec 24, 2025-6pm PST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation