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

Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

Hazardous Weather Conditions

Current conditions at

Palo Alto Airport (KPAO)

Lat: 37.46667°NLon: 122.11667°WElev: 7.0ft.

Mostly Cloudy

63°F

17°C

Humidity 77%
Wind Speed ESE 17 MPH
Barometer 29.59 in (1002.03 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 23 Dec 08:47 PM PST
Extended Forecast for

San Carlos Airport CA

Flood Watch December 24, 01:24am until December 26, 10:00pm
Wind Advisory until December 24, 04:00am
Click here for hazard details and duration
Flood Watch
Wind Advisory
  •  
    Flood Watch December 24, 01:24am until December 26, 10:00pm
    Wind Advisory until December 24, 04:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 53 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: Showers before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Some of the storms could be severe. High near 62. East wind 5 to 14 mph becoming south in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 62 °F

    Showers then
    Severe
    Thunderstorms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Some of the storms could be severe. Low around 52. South southeast wind 10 to 18 mph, with gusts as high as 46 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 52 °F

    Severe
    Thunderstorms

  • Christmas Day

    Christmas Day: Showers likely and possibly a thunderstorm before 8am, then showers between 8am and 4pm, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. High near 59. Breezy, with a south wind 17 to 23 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 59 °F

    Severe
    Thunderstorms
    and Breezy

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 49. Breezy, with a south wind 14 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 49 °F

    Severe
    Thunderstorms
    and Breezy

  • Friday

    Friday: Showers, with thunderstorms also possible after 1pm. High near 59. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 59 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 7pm, then showers likely between 7pm and 10pm, then a chance of showers and thunderstorms after 10pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 46. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely and
    Patchy Fog

  • Saturday

    Saturday: A chance of showers, mainly before 10am. Patchy fog before 10am. Otherwise, partly sunny, with a high near 57.

    High: 57 °F

    Chance
    Showers and
    Patchy Fog

Detailed Forecast

Overnight
Showers and possibly a thunderstorm, mainly before 5am, then a chance of showers and thunderstorms after 5am. Low around 53. Breezy, with a south wind 18 to 22 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Some of the storms could be severe. High near 62. East wind 5 to 14 mph becoming south in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Some of the storms could be severe. Low around 52. South southeast wind 10 to 18 mph, with gusts as high as 46 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Christmas Day
Showers likely and possibly a thunderstorm before 8am, then showers between 8am and 4pm, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. High near 59. Breezy, with a south wind 17 to 23 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 49. Breezy, with a south wind 14 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers, with thunderstorms also possible after 1pm. High near 59. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers likely and possibly a thunderstorm before 7pm, then showers likely between 7pm and 10pm, then a chance of showers and thunderstorms after 10pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 46. Chance of precipitation is 70%.
Saturday
A chance of showers, mainly before 10am. Patchy fog before 10am. Otherwise, partly sunny, with a high near 57.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 40.
Monday
Sunny, with a high near 58.
Monday Night
Mostly clear, with a low around 41.
Tuesday
Mostly sunny, with a high near 60.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Carlos Airport CA
 37.5°N 122.25°W (Elev. 82 ft)
Last Update:
12:27 am PST Dec 24, 2025
Forecast Valid:
1am PST Dec 24, 2025-6pm PST Dec 30, 2025
 
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