Strong Atmospheric River Bringing Heavy Rain to the Pacific Northwest; Areas of Snow in the North-Central and Eastern U.S.

A strong atmospheric river will bring prolonged heavy rainfall along with gusty winds to the Pacific Northwest through much of this week. The heavy rainfall may lead to widespread urban and river flooding. Accumulating snow is expected over parts of the central Appalachians and Mid-Atlantic today as well as the Upper Midwest and the Upper Great Lakes this evening into Tuesday. 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 N 5 MPH
Barometer 30.32 in (1026.75 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 08 Dec 12:55 PM PST
Extended Forecast for

Sunnyvale CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 62. North northwest wind around 6 mph.

    High: 62 °F

    Sunny

  • Tonight

    Tonight: 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. Calm wind.

    Low: 45 °F

    Mostly Clear

  • Wednesday

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

    High: 68 °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 68.

    High: 68 °F

    Sunny

  • Thursday Night

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

    Low: 47 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 62. North northwest wind around 6 mph.
Tonight
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. Calm wind.
Wednesday
Sunny, with a high near 68. Calm wind becoming north around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 68.
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.
Saturday Night
Partly cloudy, with a low around 47.
Sunday
Patchy fog. Otherwise, partly sunny, with a high near 65.
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ABOUT THIS FORECAST

 
Point Forecast:
Sunnyvale CA
 37.38°N 122.05°W (Elev. 118 ft)
12:26 pm PST Dec 8, 2025
1pm PST Dec 8, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database