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

LA HONDA (LAHC1)

Lat: 37.30523°NLon: 122.25525°WElev: 804.0ft.

NA

56°F

13°C

Humidity 72%
Wind Speed SW 8 MPH
Barometer NA
Dewpoint 47°F (8°C)
Visibility NA
Last update 25 Dec 03:07 PM PST
Extended Forecast for

5 Miles WNW Portola Valley CA

Flood Watch December 25, 03:39pm until December 26, 10:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch December 25, 03:39pm until December 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Christmas Day

    High: 54 °F

    Severe
    Thunderstorms
    and Breezy

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 3am, then showers likely. Some of the storms could be severe. Low around 46. Breezy, with a southwest wind 22 to 25 mph, with gusts as high as 43 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Breezy.
    Severe
    Thunderstorms
    then Showers
    Likely

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 53. South southwest wind 15 to 20 mph decreasing to 9 to 14 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 53 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 10pm, then a chance of showers. Mostly cloudy, with a low around 44. Southwest wind 8 to 10 mph becoming west northwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 44 °F

    Showers
    Likely

  • Saturday

    Saturday: A 20 percent chance of showers. Mostly sunny, with a high near 54. North northwest wind 6 to 10 mph.

    High: 54 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Christmas Day
Showers and possibly a thunderstorm. Some of the storms could be severe. High near 54. Breezy, with a south southwest wind around 22 mph, with gusts as high as 39 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and possibly a thunderstorm before 3am, then showers likely. Some of the storms could be severe. Low around 46. Breezy, with a southwest wind 22 to 25 mph, with gusts as high as 43 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Showers likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 53. South southwest wind 15 to 20 mph decreasing to 9 to 14 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and thunderstorms likely before 10pm, then a chance of showers. Mostly cloudy, with a low around 44. Southwest wind 8 to 10 mph becoming west northwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 54. North northwest wind 6 to 10 mph.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Sunny, with a high near 54.
Sunday Night
Mostly clear, with a low around 40.
Monday
Sunny, with a high near 57.
Monday Night
Mostly clear, with a low around 41.
Tuesday
Sunny, with a high near 59.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 60.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 46.
New Year's Day
A chance of showers. Partly sunny, with a high near 58.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WNW Portola Valley CA
 37.4°N 122.31°W (Elev. 2198 ft)
Last Update:
2:44 pm PST Dec 25, 2025
Forecast Valid:
3pm PST Dec 25, 2025-6pm PST Jan 1, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation