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

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Current conditions at

Mountain View, Moffett Field (KNUQ)

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

Clear

54°F

12°C

Humidity 76%
Wind Speed N 0 MPH
Barometer 30.27 in (1025.06 mb)
Dewpoint 46°F (8°C)
Visibility 9.00 mi
Last update 07 Dec 01:55 PM PST
Extended Forecast for

Sunnyvale CA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 59. North northwest wind around 6 mph.

    High: 59 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog before 2am, then patchy fog after 4am. Otherwise, mostly clear, with a low around 43. Calm wind.

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

  • Monday

    Monday: Patchy fog between 7am and 9am. Otherwise, sunny, with a high near 63. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 63 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, sunny, with a high near 64. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 64 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 59. North northwest wind around 6 mph.
Tonight
Patchy fog before 2am, then patchy fog after 4am. Otherwise, mostly clear, with a low around 43. Calm wind.
Monday
Patchy fog between 7am and 9am. Otherwise, sunny, with a high near 63. Calm wind becoming north northwest around 6 mph in the afternoon.
Monday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 44. Calm wind.
Tuesday
Patchy fog before 8am. Otherwise, sunny, with a high near 64. Calm wind becoming north northwest around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 46.
Wednesday
Sunny, with a high near 67.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 69.
Thursday Night
Mostly clear, with a low around 47.
Friday
Sunny, with a high near 68.
Friday Night
Mostly clear, with a low around 47.
Saturday
Sunny, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sunnyvale CA
 37.38°N 122.05°W (Elev. 118 ft)
Last Update:
12:41 pm PST Dec 7, 2025
Forecast Valid:
2pm PST Dec 7, 2025-6pm PST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation