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.

Clear

43°F

6°C

Humidity 86%
Wind Speed NE 8 MPH
Barometer 30.17 in (1021.67 mb)
Dewpoint 39°F (4°C)
Visibility 7.00 mi
Wind Chill38°F (3°C)
Last update 06 Dec 06:00 AM PST
Extended Forecast for

Castro Valley CA

Coastal Flood Advisory December 6, 06:28am until December 7, 03:00pm
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory December 6, 06:28am until December 7, 03:00pm

    NOW until 3:00pm Sun

    Coastal Flood Advisory

  • Today

    High: 62 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 45. East wind 3 to 5 mph.

    Low: 45 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 62. Calm wind becoming west around 5 mph in the afternoon.

    High: 62 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 63. Calm wind becoming west around 6 mph in the afternoon.

    High: 63 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 64.

    High: 64 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 48.

    Low: 48 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny, with a high near 62. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Tonight
Increasing clouds, with a low around 45. East wind 3 to 5 mph.
Sunday
Mostly sunny, with a high near 62. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 44. Calm wind.
Monday
Mostly sunny, with a high near 63. Calm wind becoming west around 6 mph in the afternoon.
Monday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 46.
Tuesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 48.
Wednesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 66.
Wednesday Night
Patchy fog after 5am. Otherwise, mostly clear, with a low around 48.
Thursday
Patchy fog. Otherwise, sunny, with a high near 67.
Thursday Night
Mostly clear, with a low around 47.
Friday
Patchy fog. Otherwise, sunny, with a high near 66.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.69°N 122.07°W (Elev. 197 ft)
Last Update:
2:54 am PST Dec 6, 2025
Forecast Valid:
6am 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