Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

haze

46°F

8°C

Humidity 87%
Wind Speed NE 10 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 43°F (6°C)
Visibility 6.00 mi
Wind Chill41°F (5°C)
Last update 09 Dec 07:20 PM PST
Extended Forecast for

Castro Valley CA

  • Tonight

    Tonight: Mostly clear, with a low around 45. Calm wind.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 68. Calm wind becoming north northeast around 6 mph in the morning.

    High: 68 °F

    Sunny

  • Wednesday Night

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

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 68. Calm wind becoming north northeast around 6 mph in the morning.

    High: 68 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 45. Calm wind.

    Low: 45 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 45. Calm wind.
Wednesday
Sunny, with a high near 68. Calm wind becoming north northeast around 6 mph in the morning.
Wednesday Night
Mostly clear, with a low around 46. Calm wind.
Thursday
Sunny, with a high near 68. Calm wind becoming north northeast around 6 mph in the morning.
Thursday Night
Mostly clear, with a low around 45. Calm wind.
Friday
Sunny, with a high near 65.
Friday Night
Mostly clear, with a low around 44.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 45.
Sunday
Patchy fog between 7am and 8am. Otherwise, mostly sunny, with a high near 63.
Sunday Night
Mostly cloudy, with a low around 47.
Monday
A slight chance of rain. Partly sunny, with a high near 64.
Monday Night
A chance of rain. Mostly cloudy, with a low around 51.
Tuesday
A slight chance of rain. Partly sunny, with a high near 66.
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.69°N 122.07°W (Elev. 197 ft)
12:26 pm PST Dec 9, 2025
7pm PST Dec 9, 2025-6pm PST Dec 16, 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