Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

BLACK DIAMOND (PIBC1)

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

NA

57°F

14°C

Humidity 34%
Wind Speed N 5 MPH
Barometer NA
Dewpoint 29°F (-2°C)
Visibility NA
Last update 18 Jan 10:28 PM PST
Extended Forecast for

Brentwood CA

  • Tonight

    Tonight: Areas of dense fog after 1am.  Otherwise, partly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Partly Cloudy
    then Areas
    Dense Fog

  • M.L.King Day

    M.L.King Day: Areas of dense fog before 9am.  Otherwise, mostly sunny, with a high near 58. Calm wind becoming north around 5 mph.

    High: 58 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Patchy fog after midnight.  Otherwise, partly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 11am.  Otherwise, partly sunny, with a high near 60. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 60 °F

    Patchy Fog
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 5am.  Otherwise, mostly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 7am.  Otherwise, mostly cloudy, with a high near 59.

    High: 59 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Wednesday Night

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

    Low: 45 °F

    Mostly Cloudy

  • Thursday

    Thursday: Patchy fog before 8am.  Otherwise, mostly sunny, with a high near 62.

    High: 62 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 10pm.  Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Patchy Fog

Detailed Forecast

Tonight
Areas of dense fog after 1am. Otherwise, partly cloudy, with a low around 40. Calm wind.
M.L.King Day
Areas of dense fog before 9am. Otherwise, mostly sunny, with a high near 58. Calm wind becoming north around 5 mph.
Monday Night
Patchy fog after midnight. Otherwise, partly cloudy, with a low around 40. Calm wind.
Tuesday
Patchy fog before 11am. Otherwise, partly sunny, with a high near 60. Calm wind becoming north northeast around 5 mph in the afternoon.
Tuesday Night
Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 42. Calm wind.
Wednesday
Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 59.
Wednesday Night
Mostly cloudy, with a low around 45.
Thursday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 62.
Thursday Night
Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 43.
Friday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 60.
Friday Night
Patchy fog. Otherwise, partly cloudy, with a low around 42.
Saturday
Patchy fog. Otherwise, partly sunny, with a high near 60.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 43.
Sunday
Patchy fog. Otherwise, mostly sunny, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood CA
 37.93°N 121.7°W (Elev. 75 ft)
12:26 pm PST Jan 18, 2026
10pm PST Jan 18, 2026-6pm PST Jan 25, 2026
 
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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