Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

Current conditions at

Mountain View, Moffett Field (KNUQ)

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

Clear

46°F

8°C

Humidity 93%
Wind Speed WNW 4 MPH
Barometer 30.3 in (1026.08 mb)
Dewpoint 45°F (7°C)
Visibility 8.00 mi
Wind Chill44°F (7°C)
Last update 08 Dec 09:35 PM PST
Extended Forecast for

Sunnyvale CA

  • Tonight

    Tonight: Patchy fog.  Otherwise, partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Patchy Fog

  • Tuesday

    Tuesday: Areas of fog before 10am.  Otherwise, sunny, with a high near 64. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 64 °F

    Areas Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog before 4am, then patchy fog after 5am.  Otherwise, mostly clear, with a low around 44. Calm wind.

    Low: 44 °F

    Patchy Fog

  • Wednesday

    Wednesday: Sunny, with a high near 68. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 68 °F

    Sunny

  • Wednesday Night

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

    Low: 47 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Thursday Night

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

    Low: 46 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Friday Night

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

    Low: 46 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog. Otherwise, partly cloudy, with a low around 44. Calm wind.
Tuesday
Areas of fog before 10am. Otherwise, sunny, with a high near 64. Calm wind becoming north northwest around 5 mph in the afternoon.
Tuesday Night
Patchy fog before 4am, then patchy fog after 5am. Otherwise, mostly clear, with a low around 44. Calm wind.
Wednesday
Sunny, with a high near 68. Calm wind becoming north northwest around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 47. Calm wind.
Thursday
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.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 46.
Sunday
Patchy fog. Otherwise, partly sunny, with a high near 65.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 49.
Monday
A slight chance of rain. Patchy fog. Otherwise, partly sunny, with a high near 65.
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ABOUT THIS FORECAST

 
Point Forecast:
Sunnyvale CA
 37.38°N 122.02°W (Elev. 92 ft)
12:26 pm PST Dec 8, 2025
9pm PST Dec 8, 2025-6pm PST Dec 15, 2025
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database