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

Mountain View, Moffett Field (KNUQ)

Lat: 37.40583°NLon: 122.04806°WElev: 33.0ft.

haze

61°F

16°C

Humidity 82%
Wind Speed SSE 9 MPH
Barometer 29.52 in (999.66 mb)
Dewpoint 55°F (13°C)
Visibility 5.00 mi
Last update 24 Dec 12:35 AM PST
Extended Forecast for

2 Miles NE Sunnyvale CA

Flood Watch December 24, 12:49am 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, 12:49am until December 26, 10:00pm
    Wind Advisory until December 24, 04:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 52 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: A chance of showers, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. High near 61. South southeast wind 5 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 61 °F

    Chance
    Showers then
    Severe
    Thunderstorms

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 10pm, then a chance of showers between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Some of the storms could be severe. Patchy fog after 5am. Low around 50. Breezy, with a south southeast wind 14 to 23 mph, with gusts as high as 48 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 50 °F

    Severe
    Thunderstorms
    and Patchy
    Fog

  • Christmas Day

    Christmas Day: Showers and possibly a thunderstorm. Some of the storms could be severe. High near 57. Breezy, with a south wind 15 to 22 mph, with gusts as high as 46 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 57 °F

    Breezy.
    Severe
    Thunderstorms
    then Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 47. Breezy, with a south wind 14 to 22 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 47 °F

    Severe
    Thunderstorms
    and Breezy

  • Friday

    Friday: Showers, with thunderstorms also possible after 4pm. High near 55. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 55 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 43. Chance of precipitation is 60%.

    Low: 43 °F

    Showers
    Likely and
    Patchy Fog

  • Saturday

    Saturday: A slight chance of showers before 10am. Areas of fog before noon. Otherwise, mostly sunny, with a high near 54.

    High: 54 °F

    Slight Chance
    Showers and
    Areas Fog
    then Mostly
    Sunny

Detailed Forecast

Overnight
Showers, with thunderstorms also possible after 1am. Low around 52. Breezy, with a south southeast wind 18 to 22 mph, with gusts as high as 46 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
A chance of showers, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. High near 61. South southeast wind 5 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 10pm, then a chance of showers between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Some of the storms could be severe. Patchy fog after 5am. Low around 50. Breezy, with a south southeast wind 14 to 23 mph, with gusts as high as 48 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Christmas Day
Showers and possibly a thunderstorm. Some of the storms could be severe. High near 57. Breezy, with a south wind 15 to 22 mph, with gusts as high as 46 mph. Chance of precipitation is 100%. New precipitation 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 47. Breezy, with a south wind 14 to 22 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
Showers, with thunderstorms also possible after 4pm. High near 55. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Saturday
A slight chance of showers before 10am. Areas of fog before noon. Otherwise, mostly sunny, with a high near 54.
Saturday Night
Patchy fog. Otherwise, mostly clear, with a low around 37.
Sunday
Areas of fog before 9am. Otherwise, sunny, with a high near 55.
Sunday Night
Mostly clear, with a low around 37.
Monday
Sunny, with a high near 57.
Monday Night
Mostly clear, with a low around 39.
Tuesday
Mostly sunny, with a high near 60.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NE Sunnyvale CA
 37.41°N 122°W (Elev. 23 ft)
Last Update:
12:27 am PST Dec 24, 2025
Forecast Valid:
12am PST Dec 24, 2025-6pm PST Dec 30, 2025
 
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