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

50°F

10°C

Humidity 81%
Wind Speed NNW 5 MPH
Barometer 30.28 in (1025.4 mb)
Dewpoint 45°F (7°C)
Visibility 8.00 mi
Wind Chill48°F (9°C)
Last update 07 Dec 12:35 PM PST
Extended Forecast for

Sunnyvale CA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 58. North northwest wind 3 to 6 mph.

    High: 58 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after midnight. Otherwise, mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

  • Monday

    Monday: Patchy fog before 9am. Otherwise, sunny, with a high near 63. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 63 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog after 1am. Otherwise, mostly clear, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 9am. 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 45.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 67.

    High: 67 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Thursday

    Thursday: Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 68.

    High: 68 °F

    Patchy Fog
    then Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 58. North northwest wind 3 to 6 mph.
Tonight
Patchy fog after midnight. Otherwise, mostly clear, with a low around 42. Calm wind.
Monday
Patchy fog before 9am. Otherwise, sunny, with a high near 63. Calm wind becoming north northwest around 5 mph in the afternoon.
Monday Night
Patchy fog after 1am. Otherwise, mostly clear, with a low around 44. Calm wind.
Tuesday
Patchy fog before 9am. 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 45.
Wednesday
Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 67.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 68.
Thursday Night
Mostly clear, with a low around 46.
Friday
Sunny, with a high near 68.
Friday Night
Mostly clear, with a low around 46.
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 122.02°W (Elev. 92 ft)
Last Update:
12:41 pm PST Dec 7, 2025
Forecast Valid:
12pm PST Dec 7, 2025-6pm PST Dec 13, 2025
 
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Additional Resources

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