Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

Current conditions at

Berkeley Lab (LBNL1)

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

NA

45°F

7°C

Humidity 84%
Wind Speed N 0 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Last update 09 Dec 02:30 AM PST
Extended Forecast for

Hercules CA

  • Overnight

    Overnight: Mostly cloudy, with a low around 42. Light east wind.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56. East wind around 6 mph.

    High: 56 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 44. Calm wind becoming east around 5 mph after midnight.

    Low: 44 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 59. East northeast wind around 6 mph.

    High: 59 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 44. Light northeast wind.

    Low: 44 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 42. Light east wind.
Tuesday
Mostly sunny, with a high near 56. East wind around 6 mph.
Tuesday Night
Mostly clear, with a low around 44. Calm wind becoming east around 5 mph after midnight.
Wednesday
Sunny, with a high near 59. East northeast wind around 6 mph.
Wednesday Night
Mostly clear, with a low around 44. Light northeast wind.
Thursday
Mostly sunny, with a high near 61.
Thursday Night
Mostly clear, with a low around 44.
Friday
Mostly sunny, with a high near 58.
Friday Night
Partly cloudy, with a low around 43.
Saturday
Mostly sunny, with a high near 58.
Saturday Night
Partly cloudy, with a low around 44.
Sunday
Partly sunny, with a high near 58.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 46.
Monday
A slight chance of rain. Partly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
Hercules CA
 38°N 122.27°W (Elev. 377 ft)
2:42 am PST Dec 9, 2025
2am PST Dec 9, 2025-6pm PST Dec 15, 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