National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

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

BLACK DIAMOND (PIBC1)

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

NA

54°F

12°C

Humidity 52%
Wind Speed ENE 2 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Last update 08 Dec 03:28 PM PST
Extended Forecast for

Brentwood CA

  • Tonight

    Tonight: Patchy dense fog. Otherwise, mostly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Dense
    Fog

  • Tuesday

    Tuesday: Areas of fog before noon. Otherwise, partly sunny, with a high near 52. Calm wind becoming north around 5 mph in the afternoon.

    High: 52 °F

    Areas Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog before 9pm, then patchy fog after midnight. 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 60. Light and variable wind.

    High: 60 °F

    Areas Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 60.

    High: 60 °F

    Areas Fog
    then Mostly
    Sunny

  • Thursday Night

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

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Areas of fog before 11am. Otherwise, mostly sunny, with a high near 59.

    High: 59 °F

    Areas Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

Detailed Forecast

Tonight
Patchy dense fog. Otherwise, mostly cloudy, with a low around 42. Calm wind.
Tuesday
Areas of fog before noon. Otherwise, partly sunny, with a high near 52. Calm wind becoming north around 5 mph in the afternoon.
Tuesday Night
Patchy fog before 9pm, then patchy fog after midnight. Otherwise, partly cloudy, with a low around 43. Calm wind.
Wednesday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 60. Light and variable wind.
Wednesday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 44. Calm wind.
Thursday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 60.
Thursday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 43.
Friday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 59.
Friday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 43.
Saturday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 59.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44.
Sunday
Areas of fog. Otherwise, partly sunny, with a high near 60.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 46.
Monday
A slight chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 61.
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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:
12:26 pm PST Dec 8, 2025
Forecast Valid:
3pm PST Dec 8, 2025-6pm PST Dec 15, 2025
 
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Additional Resources

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High Temperature

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Chance of Precipitation