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

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Hazardous Weather Conditions

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Mist

52°F

11°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 29.83 in (1010.16 mb)
Dewpoint 50°F (10°C)
Visibility 5.00 mi
Last update 01 Jan 07:00 AM PST
Extended Forecast for

Hillsborough CA

Coastal Flood Advisory January 1, 07:29am until January 4, 02:00pm
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory January 1, 07:29am until January 4, 02:00pm

    NOW until 2:00pm Sun

    Coastal Flood Advisory

  • New Year's Day

    High: 60 °F

    Showers

  • Tonight

    Tonight: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 51. South wind 7 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday

    Friday: Showers likely, mainly after 10am. Mostly cloudy, with a high near 60. South southeast wind 9 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 60 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers. Low around 54. South wind 17 to 20 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 54 °F

    Showers

  • Saturday

    Saturday: Showers. High near 61. South wind 18 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 61 °F

    Showers

  • Saturday Night

    Saturday Night: Showers before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then showers after 4am. Low around 52. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 52 °F

    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 10am. High near 59. Chance of precipitation is 100%.

    High: 59 °F

    Showers

  • Sunday Night

    Sunday Night: Showers. Cloudy, with a low around 49.

    Low: 49 °F

    Showers

Detailed Forecast

New Year's Day
Showers, with thunderstorms also possible after 10am. High near 60. South wind 7 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers likely, mainly before 10pm. Mostly cloudy, with a low around 51. South wind 7 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers likely, mainly after 10am. Mostly cloudy, with a high near 60. South southeast wind 9 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Showers. Low around 54. South wind 17 to 20 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Showers. High near 61. South wind 18 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Showers before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then showers after 4am. Low around 52. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers, with thunderstorms also possible after 10am. High near 59. Chance of precipitation is 100%.
Sunday Night
Showers. Cloudy, with a low around 49.
Monday
Showers. Mostly cloudy, with a high near 57.
Monday Night
Showers likely, mainly before 10pm. Mostly cloudy, with a low around 46.
Tuesday
A chance of showers. Partly sunny, with a high near 56.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 44.
Wednesday
A slight chance of showers. Partly sunny, with a high near 56.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hillsborough CA
 37.55°N 122.35°W (Elev. 197 ft)
Last Update:
1:25 am PST Jan 1, 2026
Forecast Valid:
7am PST Jan 1, 2026-6pm PST Jan 7, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation