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

45°F

7°C

Humidity 93%
Wind Speed NE 9 MPH
Barometer 30.19 in (1022.35 mb)
Dewpoint 43°F (6°C)
Visibility 7.00 mi
Wind Chill40°F (4°C)
Last update 06 Dec 09:35 PM PST
Extended Forecast for

Castro Valley CA

Coastal Flood Advisory December 6, 09:49pm until December 7, 03:00pm
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory December 6, 09:49pm until December 7, 03:00pm

    NOW until 3:00pm Sun

    Coastal Flood Advisory

  • Tonight

    Low: 45 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 62. Calm wind becoming west around 6 mph in the afternoon.

    High: 62 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44. Calm wind becoming northeast around 5 mph in the evening.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 63. Calm wind becoming west northwest around 5 mph in the afternoon.

    High: 63 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy fog between 1am and 2am. Otherwise, partly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 65.

    High: 65 °F

    Patchy Fog
    then Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 45. Calm wind.
Sunday
Mostly sunny, with a high near 62. Calm wind becoming west around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 44. Calm wind becoming northeast around 5 mph in the evening.
Monday
Mostly sunny, with a high near 63. Calm wind becoming west northwest around 5 mph in the afternoon.
Monday Night
Patchy fog between 1am and 2am. Otherwise, partly cloudy, with a low around 46. Calm wind.
Tuesday
Mostly sunny, with a high near 63.
Tuesday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 47.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 65.
Wednesday Night
Patchy fog after 5am. Otherwise, mostly clear, with a low around 48.
Thursday
Patchy fog before 9am. Otherwise, sunny, with a high near 67.
Thursday Night
Patchy fog. Otherwise, mostly clear, with a low around 46.
Friday
Patchy fog. Otherwise, sunny, with a high near 65.
Friday Night
Mostly clear, with a low around 46.
Saturday
Patchy fog. Otherwise, mostly sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.71°N 122.08°W (Elev. 397 ft)
Last Update:
12:26 pm PST Dec 6, 2025
Forecast Valid:
9pm PST Dec 6, 2025-6pm PST Dec 13, 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