National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Current conditions at

Berkeley Lab (LBNL1)

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

NA

53°F

12°C

Humidity 73%
Wind Speed WSW 1 MPH
Barometer NA
Dewpoint 45°F (7°C)
Visibility NA
Last update 07 Dec 12:45 PM PST
Extended Forecast for

Hercules CA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 48. East wind 3 to 5 mph.

    High: 48 °F

    Mostly Sunny

  • Tonight

    Tonight: Widespread dense fog, mainly after 2am. Otherwise, partly cloudy, with a low around 42. Light east wind.

    Low: 42 °F

    Mostly Clear
    then Dense
    Fog

  • Monday

    Monday: Widespread dense fog, mainly before 8am. Otherwise, mostly sunny, with a high near 57. Northeast wind 3 to 5 mph.

    High: 57 °F

    Dense Fog
    then Sunny

  • Monday Night

    Monday Night: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 58. North northeast wind 3 to 5 mph.

    High: 58 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 61.

    High: 61 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 48. East wind 3 to 5 mph.
Tonight
Widespread dense fog, mainly after 2am. Otherwise, partly cloudy, with a low around 42. Light east wind.
Monday
Widespread dense fog, mainly before 8am. Otherwise, mostly sunny, with a high near 57. Northeast wind 3 to 5 mph.
Monday Night
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 44. Calm wind.
Tuesday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 58. North northeast wind 3 to 5 mph.
Tuesday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 45.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 61.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Mostly sunny, with a high near 61.
Thursday Night
Mostly clear, with a low around 45.
Friday
Mostly sunny, with a high near 60.
Friday Night
Mostly clear, with a low around 44.
Saturday
Mostly sunny, with a high near 60.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hercules CA
 38°N 122.27°W (Elev. 377 ft)
Last Update:
12:41 pm PST Dec 7, 2025
Forecast Valid:
1pm PST Dec 7, 2025-6pm PST Dec 13, 2025
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation