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

Tracking Weekend Storm Impacts

A storm and trailing cold front will continue to slowly move through the Gulf Coast and Southeast U.S. through this weekend with widespread rain showers and isolated thunderstorms. A fast-moving clipper storm may bring several inches of snow to the north-central Plains, Midwest, eastern Great Lakes, and Northeast regions this weekend. Read More >

Hazardous Weather Conditions

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

Lat: 37.66083°NLon: 122.11833°WElev: 46.0ft.

Mist

45°F

7°C

Humidity 87%
Wind Speed NNE 9 MPH
Barometer 30.17 in (1021.67 mb)
Dewpoint 41°F (5°C)
Visibility 6.00 mi
Wind Chill40°F (4°C)
Last update 06 Dec 03:00 AM PST
Extended Forecast for

Castro Valley CA

Coastal Flood Advisory December 6, 03:22am until December 7, 03:00pm
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory December 6, 03:22am until December 7, 03:00pm

    NOW until 3:00pm Sun

    Coastal Flood Advisory

  • Overnight

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 61. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 45. East wind 3 to 5 mph.

    Low: 45 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 61. Calm wind becoming west around 5 mph in the afternoon.

    High: 61 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44. Light east wind.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 63.

    High: 63 °F

    Patchy Fog
    then Mostly
    Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 41. Northeast wind around 5 mph.
Saturday
Sunny, with a high near 61. Calm wind becoming west northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 45. East wind 3 to 5 mph.
Sunday
Mostly sunny, with a high near 61. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 44. Light east wind.
Monday
Mostly sunny, with a high near 63.
Monday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 45.
Tuesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 47.
Wednesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 66.
Wednesday Night
Patchy fog. Otherwise, mostly clear, with a low around 48.
Thursday
Patchy fog. Otherwise, sunny, with a high near 66.
Thursday Night
Patchy fog. Otherwise, mostly clear, with a low around 46.
Friday
Patchy fog. Otherwise, sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.71°N 122.08°W (Elev. 397 ft)
Last Update:
2:54 am PST Dec 6, 2025
Forecast Valid:
3am PST Dec 6, 2025-6pm PST Dec 12, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation