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 Francisco, San Francisco International Airport (KSFO)

Lat: 37.61961°NLon: 122.36558°WElev: 10.0ft.

Rain

57°F

14°C

Humidity 87%
Wind Speed SW 25 MPH
Barometer 29.55 in (1000.68 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 24 Dec 05:00 AM PST
Extended Forecast for

San Mateo CASimilar City Names

Flood Watch December 24, 05:22am until December 26, 10:00pm
Wind Advisory December 24, 08:00pm until December 25, 10:00am
Wind Advisory December 24, 05:22am until December 24, 08:00am
Flood Advisory December 24, 05:22am until December 24, 07:45am
Click here for hazard details and duration
Flood Watch
Wind Advisory
Wind Advisory
Flood Advisory
  •  
    Flood Watch December 24, 05:22am until December 26, 10:00pm
    Wind Advisory December 24, 05:22am until December 24, 08:00am
    Flood Advisory December 24, 05:22am until December 24, 07:45am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 53 °F

    Chance
    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 61. Light southeast wind becoming south southeast 8 to 13 mph 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: 61 °F

    Showers then
    Severe
    Thunderstorms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms before 1am, then showers and possibly a thunderstorm, mainly after 1am. Some of the storms could be severe. Steady temperature around 55. South southeast wind 11 to 17 mph, with gusts as high as 47 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 55 °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 58. Breezy, with a south wind 18 to 24 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: 58 °F

    Severe
    Thunderstorms
    and Breezy

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 50. Breezy, with a south wind 14 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 50 °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 4am. 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. Areas of fog before 10am. Otherwise, mostly sunny, with a high near 56.

    High: 56 °F

    Chance
    Showers and
    Areas Fog

Detailed Forecast

Overnight
A 40 percent chance of showers. Mostly cloudy, with a low around 53. Breezy, with a southwest wind around 22 mph, with gusts as high as 44 mph.
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 61. Light southeast wind becoming south southeast 8 to 13 mph 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 before 1am, then showers and possibly a thunderstorm, mainly after 1am. Some of the storms could be severe. Steady temperature around 55. South southeast wind 11 to 17 mph, with gusts as high as 47 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 58. Breezy, with a south wind 18 to 24 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 50. Breezy, with a south wind 14 to 23 mph, with gusts as high as 37 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 4am. Otherwise, mostly cloudy, with a low around 46. Chance of precipitation is 70%.
Saturday
A chance of showers, mainly before 10am. Areas of fog before 10am. Otherwise, mostly sunny, with a high near 56.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Sunny, with a high near 56.
Sunday Night
Mostly clear, with a low around 40.
Monday
Sunny, with a high near 58.
Monday Night
Mostly clear, with a low around 42.
Tuesday
Mostly sunny, with a high near 60.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Mateo CASimilar City Names
 37.56°N 122.33°W (Elev. 108 ft)
Last Update:
4:29 am PST Dec 24, 2025
Forecast Valid:
5am PST Dec 24, 2025-6pm PST Dec 30, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation