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 >

Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

NA

57°F

14°C

Humidity 80%
Wind Speed SSE 7 MPH
Barometer NA
Dewpoint 51°F (11°C)
Visibility NA
Last update 25 Dec 12:10 AM PST
Extended Forecast for

5 Miles WSW Saratoga CA

Flood Watch December 25, 12:22am until December 26, 10:00pm
Wind Advisory until December 25, 10:00am
Flood Advisory until December 25, 03:15am
Click here for hazard details and duration
Flood Watch
Wind Advisory
Flood Advisory
  •  
    Flood Watch December 25, 12:22am until December 26, 10:00pm
    Wind Advisory until December 25, 10:00am
    Flood Advisory until December 25, 03:15am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 49 °F

    Severe
    Thunderstorms
    and Windy

  • Christmas Day

    Christmas Day: Rain and possibly a thunderstorm before 7am, then rain between 7am and 10am, then showers and possibly a thunderstorm after 10am. Some of the storms could be severe.  High near 48. Windy, with a south southwest wind 32 to 37 mph decreasing to 22 to 27 mph in the afternoon. Winds could gust as high as 49 mph.  Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 48 °F

    Severe
    Thunderstorms
    and Windy

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 10pm, then rain, mainly after 10pm. Some of the storms could be severe.  Low around 44. Breezy, with a southwest wind 24 to 29 mph, with gusts as high as 43 mph.  Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 44 °F

    Breezy.
    Severe
    Thunderstorms
    then Rain

  • Friday

    Friday: Rain.  High near 48. South wind 11 to 21 mph, with gusts as high as 31 mph.  Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 48 °F

    Rain

  • Friday Night

    Friday Night: Rain likely, mainly before 10pm.  Mostly cloudy, with a low around 46. South southwest wind 7 to 10 mph becoming west northwest after midnight.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Rain Likely
    then Chance
    Rain

  • Saturday

    Saturday: A slight chance of rain and snow before 10am, then a slight chance of rain.  Mostly sunny, with a high near 48. Chance of precipitation is 20%.

    High: 48 °F

    Slight Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Some of the storms could be severe. Steady temperature around 49. Windy, with a south southwest wind 37 to 42 mph increasing to 50 to 55 mph. Winds could gust as high as 70 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Christmas Day
Rain and possibly a thunderstorm before 7am, then rain between 7am and 10am, then showers and possibly a thunderstorm after 10am. Some of the storms could be severe. High near 48. Windy, with a south southwest wind 32 to 37 mph decreasing to 22 to 27 mph in the afternoon. Winds could gust as high as 49 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
Showers and possibly a thunderstorm before 10pm, then rain, mainly after 10pm. Some of the storms could be severe. Low around 44. Breezy, with a southwest wind 24 to 29 mph, with gusts as high as 43 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
Rain. High near 48. South wind 11 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Rain likely, mainly before 10pm. Mostly cloudy, with a low around 46. South southwest wind 7 to 10 mph becoming west northwest after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A slight chance of rain and snow before 10am, then a slight chance of rain. Mostly sunny, with a high near 48. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Sunny, with a high near 50.
Sunday Night
Clear, with a low around 41.
Monday
Sunny, with a high near 53.
Monday Night
Clear, with a low around 43.
Tuesday
Sunny, with a high near 57.
Tuesday Night
Mostly clear, with a low around 46.
Wednesday
Partly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Saratoga CA
 37.23°N 122.1°W (Elev. 3199 ft)
11:27 pm PST Dec 24, 2025
12am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
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Additional Resources

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