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

LAS TRAMPAS (LTRC1)

Lat: 37.83389°NLon: 122.06694°WElev: 1760.0ft.

NA

51°F

11°C

Humidity 73%
Wind Speed E 7 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Last update 07 Dec 09:28 PM PST
Extended Forecast for

Walnut Creek CA

  • Tonight

    Tonight: Areas of dense fog. Otherwise, partly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Areas Dense
    Fog

  • Monday

    Monday: Areas of dense fog before 10am. Otherwise, mostly sunny, with a high near 48. Light north wind.

    High: 48 °F

    Areas Dense
    Fog then
    Sunny

  • Monday Night

    Monday Night: Widespread fog, mainly after 4am. Otherwise, partly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Fog

  • Tuesday

    Tuesday: Widespread fog, mainly before 8am. Otherwise, mostly sunny, with a high near 62. Light north wind.

    High: 62 °F

    Fog then
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Patchy Fog

  • Wednesday

    Wednesday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 65.

    High: 65 °F

    Areas Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 11pm. Otherwise, mostly clear, with a low around 44.

    Low: 44 °F

    Patchy Fog

  • Thursday

    Thursday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 64.

    High: 64 °F

    Areas Fog
    then Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

Detailed Forecast

Tonight
Areas of dense fog. Otherwise, partly cloudy, with a low around 40. Calm wind.
Monday
Areas of dense fog before 10am. Otherwise, mostly sunny, with a high near 48. Light north wind.
Monday Night
Widespread fog, mainly after 4am. Otherwise, partly cloudy, with a low around 41. Calm wind.
Tuesday
Widespread fog, mainly before 8am. Otherwise, mostly sunny, with a high near 62. Light north wind.
Tuesday Night
Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 43. Calm wind.
Wednesday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 65.
Wednesday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 44.
Thursday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 64.
Thursday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 43.
Friday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 64.
Friday Night
Patchy fog. Otherwise, mostly clear, with a low around 43.
Saturday
Areas of fog. Otherwise, mostly sunny, with a high near 64.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 43.
Sunday
Areas of fog. Otherwise, partly sunny, with a high near 62.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Walnut Creek CA
 37.9°N 122.07°W (Elev. 203 ft)
Last Update:
8:31 pm PST Dec 7, 2025
Forecast Valid:
10pm PST Dec 7, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

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National Digital Forecast Database

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Chance of Precipitation