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

Mountain View, Moffett Field (KNUQ)

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

Mostly Cloudy

61°F

16°C

Humidity 59%
Wind Speed SSE 5 MPH
Barometer 29.84 in (1010.5 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 25 Dec 10:10 AM PST
Extended Forecast for

4 Miles SSE Fremont CA

Flood Watch December 25, 10:43am until December 26, 10:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch December 25, 10:43am until December 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Christmas Day

    High: 57 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: Rain before 7pm, then showers and possibly a thunderstorm between 7pm and 10pm, then rain likely after 10pm. Some of the storms could be severe. Low around 48. Breezy, with a south wind 13 to 22 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 48 °F

    Severe
    Thunderstorms
    and Breezy
    then Rain
    Likely

  • Friday

    Friday: Rain, mainly before 4pm. High near 56. South southeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 56 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 44. South wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 44 °F

    Chance Rain
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 10am. Partly sunny, with a high near 53. Light and variable wind becoming north around 6 mph in the morning.

    High: 53 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 4am. Otherwise, mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 7am. Otherwise, sunny, with a high near 53.

    High: 53 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 2am. Otherwise, mostly clear, with a low around 36.

    Low: 36 °F

    Clear then
    Patchy Frost

Detailed Forecast

Christmas Day
Showers and possibly a thunderstorm before 4pm, then rain after 4pm. Some of the storms could be severe. High near 57. South southeast wind 17 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Rain before 7pm, then showers and possibly a thunderstorm between 7pm and 10pm, then rain likely after 10pm. Some of the storms could be severe. Low around 48. Breezy, with a south wind 13 to 22 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain, mainly before 4pm. High near 56. South southeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A 50 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 44. South wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 20 percent chance of rain before 10am. Partly sunny, with a high near 53. Light and variable wind becoming north around 6 mph in the morning.
Saturday Night
Patchy frost after 4am. Otherwise, mostly clear, with a low around 37.
Sunday
Patchy frost before 7am. Otherwise, sunny, with a high near 53.
Sunday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 36.
Monday
Areas of frost before 8am. Otherwise, sunny, with a high near 56.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Sunny, with a high near 58.
Tuesday Night
Partly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Fremont CA
 37.48°N 121.96°W (Elev. 3 ft)
Last Update:
8:59 am PST Dec 25, 2025
Forecast Valid:
10am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation