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

BLACK DIAMOND (PIBC1)

Lat: 37.95°NLon: 121.88444°WElev: 1600.0ft.

NA

50°F

10°C

Humidity 83%
Wind Speed E 2 MPH
Barometer NA
Dewpoint 45°F (7°C)
Visibility NA
Last update 07 Dec 03:28 PM PST
Extended Forecast for

Brentwood CA

  • Tonight

    Tonight: Widespread dense fog after 10pm. Otherwise, mostly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Dense Fog

  • Monday

    Monday: Widespread dense fog, mainly before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 54. Light and variable wind.

    High: 54 °F

    Dense Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog before 4am, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 58. Light and variable wind.

    High: 58 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 61.

    High: 61 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Tonight
Widespread dense fog after 10pm. Otherwise, mostly cloudy, with a low around 42. Calm wind.
Monday
Widespread dense fog, mainly before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 54. Light and variable wind.
Monday Night
Patchy fog before 4am, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 42. Calm wind.
Tuesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 58. Light and variable wind.
Tuesday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 44. Calm wind.
Wednesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 61.
Wednesday Night
Partly cloudy, with a low around 45.
Thursday
Mostly sunny, with a high near 61.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 43.
Saturday
Mostly sunny, with a high near 60.
Saturday Night
Partly cloudy, with a low around 43.
Sunday
Partly sunny, with a high near 59.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood CA
 37.93°N 121.7°W (Elev. 75 ft)
Last Update:
12:41 pm PST Dec 7, 2025
Forecast Valid:
3pm 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