Tracking Atmospheric River in the Northwest U.S. and Clipper with Winter Weather in the Northeast U.S.

A prolonged atmospheric river will continue to bring gusty winds, heavy rainfall which may lead to urban and river flooding with possible landslides, and heavy inter-mountain snow over the Pacific Northwest into the northern Rockies through Thursday. A clipper will cross the Great Lakes and Northeast U.S. into Thursday with areas of moderate to heavy snow and mixed wintry precipitation. Read More >

Current conditions at

Berkeley Lab (LBNL1)

Lat: 37.8771°NLon: 122.2486°WElev: 888.0ft.

NA

58°F

14°C

Humidity 60%
Wind Speed WSW 1 MPH
Barometer NA
Dewpoint 44°F (7°C)
Visibility NA
Last update 10 Dec 12:30 PM PST
Extended Forecast for

Hercules CA

  • This Afternoon

    This Afternoon: Sunny, with a steady temperature around 47. East wind 7 to 9 mph.

    High: 47 °F

    Sunny

  • Tonight

    Tonight: Widespread dense fog, mainly after 2am.  Otherwise, mostly clear, with a low around 43. East wind 6 to 8 mph.

    Low: 43 °F

    Mostly Clear
    then Dense
    Fog

  • Thursday

    Thursday: Widespread dense fog, mainly before 9am.  Otherwise, sunny, with a high near 53. East northeast wind 6 to 9 mph.

    High: 53 °F

    Dense Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 42. East wind 5 to 7 mph.

    Low: 42 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 53. East northeast wind around 10 mph.

    High: 53 °F

    Mostly Sunny

  • Friday Night

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

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy fog after midnight.  Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Partly sunny, with a high near 58.

    High: 58 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a steady temperature around 47. East wind 7 to 9 mph.
Tonight
Widespread dense fog, mainly after 2am. Otherwise, mostly clear, with a low around 43. East wind 6 to 8 mph.
Thursday
Widespread dense fog, mainly before 9am. Otherwise, sunny, with a high near 53. East northeast wind 6 to 9 mph.
Thursday Night
Mostly clear, with a low around 42. East wind 5 to 7 mph.
Friday
Mostly sunny, with a high near 53. East northeast wind around 10 mph.
Friday Night
Mostly clear, with a low around 42.
Saturday
Mostly sunny, with a high near 57.
Saturday Night
Patchy fog after midnight. Otherwise, partly cloudy, with a low around 43.
Sunday
Partly sunny, with a high near 58.
Sunday Night
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 45.
Monday
A slight chance of showers. Patchy fog. Otherwise, mostly cloudy, with a high near 58.
Monday Night
A chance of showers. Mostly cloudy, with a low around 51.
Tuesday
A chance of showers. Mostly cloudy, with a high near 60.
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ABOUT THIS FORECAST

 
Point Forecast:
Hercules CA
 38°N 122.27°W (Elev. 377 ft)
12:37 pm PST Dec 10, 2025
12pm PST Dec 10, 2025-6pm PST Dec 16, 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