Tracking Atmospheric River in the Northwest U.S. and Clipper with Winter Weather in the Northeast U.S.

A prolonged atmospheric river will continue to bring gusty winds, heavy rainfall which may lead to urban and river flooding with possible landslides, and heavy inter-mountain snow over the Pacific Northwest into the northern Rockies through Thursday. A clipper will cross the Great Lakes and Northeast U.S. into Thursday with areas of moderate to heavy snow and mixed wintry precipitation. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

47°F

8°C

Humidity 83%
Wind Speed NW 3 MPH
Barometer 30.14 in (1020.66 mb)
Dewpoint 42°F (6°C)
Visibility 8.00 mi
Last update 10 Dec 06:54 PM PST
Extended Forecast for

Castro Valley CA

  • Tonight

    Tonight: Clear, with a low around 44. East northeast wind around 6 mph.

    Low: 44 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 63. East wind 5 to 7 mph becoming light and variable.

    High: 63 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 45. East northeast wind around 7 mph.

    Low: 45 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 63. North wind around 6 mph.

    High: 63 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 44. East wind around 6 mph.

    Low: 44 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Sunday

    Sunday: Patchy fog before 9am.  Otherwise, mostly sunny, with a high near 63.

    High: 63 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 44. East northeast wind around 6 mph.
Thursday
Sunny, with a high near 63. East wind 5 to 7 mph becoming light and variable.
Thursday Night
Mostly clear, with a low around 45. East northeast wind around 7 mph.
Friday
Sunny, with a high near 63. North wind around 6 mph.
Friday Night
Mostly clear, with a low around 44. East wind around 6 mph.
Saturday
Sunny, with a high near 64.
Saturday Night
Mostly clear, with a low around 45.
Sunday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 63.
Sunday Night
Partly cloudy, with a low around 45.
Monday
A slight chance of showers after 4pm. Partly sunny, with a high near 64.
Monday Night
A chance of showers. Mostly cloudy, with a low around 52.
Tuesday
A chance of showers. Patchy fog. Otherwise, mostly cloudy, with a high near 65.
Tuesday Night
A chance of showers. Patchy fog. Otherwise, mostly cloudy, with a low around 53.
Wednesday
A slight chance of showers. Patchy fog. Otherwise, partly sunny, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.69°N 122.07°W (Elev. 197 ft)
12:37 pm PST Dec 10, 2025
7pm PST Dec 10, 2025-6pm PST Dec 17, 2025
 
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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