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

48°F

9°C

Humidity 64%
Wind Speed NNE 11 MPH
Barometer NA
Dewpoint 36°F (2°C)
Visibility NA
Wind Chill43°F (6°C)
Last update 20 Jan 03:28 AM PST
Extended Forecast for

2 Miles NW Brentwood CA

  • Overnight

    Overnight: Patchy dense fog.  Otherwise, mostly cloudy, with a low around 39. Calm wind.

    Low: 39 °F

    Patchy Dense
    Fog

  • Tuesday

    Tuesday: Patchy dense fog before noon.  Otherwise, mostly cloudy, with a high near 56. Calm wind becoming northeast around 5 mph.

    High: 56 °F

    Patchy Dense
    Fog then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 59. Light north wind.

    High: 59 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

  • Thursday Night

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

    Low: 44 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy dense fog. Otherwise, mostly cloudy, with a low around 39. Calm wind.
Tuesday
Patchy dense fog before noon. Otherwise, mostly cloudy, with a high near 56. Calm wind becoming northeast around 5 mph.
Tuesday Night
Mostly cloudy, with a low around 44. Calm wind.
Wednesday
Cloudy, with a high near 59. Light north wind.
Wednesday Night
Cloudy, with a low around 46. Calm wind.
Thursday
Partly sunny, with a high near 62.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 60.
Friday Night
Mostly clear, with a low around 42.
Saturday
Mostly sunny, with a high near 60.
Saturday Night
Partly cloudy, with a low around 42.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 42.
Monday
Patchy fog. Otherwise, partly sunny, with a high near 60.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW Brentwood CA
 37.95°N 121.71°W (Elev. 82 ft)
12:26 am PST Jan 20, 2026
3am PST Jan 20, 2026-6pm PST Jan 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database