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

56°F

13°C

Humidity 58%
Wind Speed NNE 4 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 07 Dec 03:28 PM PST
Extended Forecast for

Walnut Creek CA

  • Tonight

    Tonight: Widespread dense fog, mainly after 2am. Otherwise, partly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Dense Fog

  • Monday

    Monday: Widespread dense fog, mainly before 8am. Otherwise, mostly sunny, with a high near 57. Light north wind.

    High: 57 °F

    Dense Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 62. Light north wind.

    High: 62 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 65.

    High: 65 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
Widespread dense fog, mainly after 2am. Otherwise, partly cloudy, with a low around 40. Calm wind.
Monday
Widespread dense fog, mainly before 8am. Otherwise, mostly sunny, with a high near 57. Light north wind.
Monday Night
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 42. Calm wind.
Tuesday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 62. Light north wind.
Tuesday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 43. Calm wind.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 44.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Mostly clear, with a low around 43.
Friday
Mostly sunny, with a high near 64.
Friday Night
Mostly clear, with a low around 43.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 44.
Sunday
Partly sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Walnut Creek CA
 37.9°N 122.07°W (Elev. 203 ft)
Last Update:
12:41 pm PST Dec 7, 2025
Forecast Valid:
4pm PST Dec 7, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation