Powerful Winter Storm from the Upper Midwest into the Northeast; Severe Thunderstorms in the Midwest and Ohio Valley

A rapidly-intensifying storm is expected to bring heavy snow, blizzard conditions, and icing from the Upper Midwest through the Great Lakes and Northeast. Scattered severe thunderstorms may produce severe/damaging wind gusts and a couple of tornadoes across parts of the Midwest and lower Ohio Valley through the evening. Arctic air will expand across the central and southern U.S.. Read More >

Current conditions at

Berkeley Lab (LBNL1)

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

NA

53°F

12°C

Humidity 65%
Wind Speed W 1 MPH
Barometer NA
Dewpoint 42°F (6°C)
Visibility NA
Last update 28 Dec 02:30 PM PST
Extended Forecast for

Hercules CA

Cold Weather Advisory December 29, 01:00am until December 29, 09:00am
Click here for hazard details and duration
Cold Weather Advisory
  • This Afternoon

    This Afternoon: Sunny, with a high near 54. East wind around 6 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 41. East northeast wind 5 to 7 mph.

    Low: 41 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 53. East northeast wind 7 to 9 mph.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 39. Northeast wind around 6 mph.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52. East northeast wind around 9 mph.

    High: 52 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 10 percent chance of rain after 4pm.  Partly sunny, with a high near 50.

    High: 50 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: A chance of rain, mainly after 10pm.  Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

  • New Year's Day

    New Year's Day: Rain likely, mainly after 10am.  Mostly cloudy, with a high near 50.

    High: 50 °F

    Rain Likely

Detailed Forecast

This Afternoon
Sunny, with a high near 54. East wind around 6 mph.
Tonight
Mostly clear, with a low around 41. East northeast wind 5 to 7 mph.
Monday
Sunny, with a high near 53. East northeast wind 7 to 9 mph.
Monday Night
Mostly clear, with a low around 39. Northeast wind around 6 mph.
Tuesday
Mostly sunny, with a high near 52. East northeast wind around 9 mph.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
A 10 percent chance of rain after 4pm. Partly sunny, with a high near 50.
Wednesday Night
A chance of rain, mainly after 10pm. Mostly cloudy, with a low around 45.
New Year's Day
Rain likely, mainly after 10am. Mostly cloudy, with a high near 50.
Thursday Night
Rain likely. Cloudy, with a low around 48.
Friday
Rain likely. Mostly cloudy, with a high near 54.
Friday Night
A chance of rain. Mostly cloudy, with a low around 48.
Saturday
A chance of rain. Mostly cloudy, with a high near 54.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Hercules CA
 38.02°N 122.27°W (Elev. 92 ft)
12:27 pm PST Dec 28, 2025
2pm PST Dec 28, 2025-6pm PST Jan 3, 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