Significant and Catastrophic Flooding in the Pacific Northwest; Very Cold Temperatures in the Northern Plains

The atmospheric river over the Pacific Northwest will begin to subside today, but lingering rainfall will exacerbate ongoing catastrophic major river flooding, and landslides will continue across portions of western Washington and northwest Oregon for several days. Arctic air will plummet southward into the Northern Plains today, bringing cold air in the single digits to the region by Friday. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

45°F

7°C

Humidity 87%
Wind Speed NE 9 MPH
Barometer 30.14 in (1020.66 mb)
Dewpoint 41°F (5°C)
Visibility 8.00 mi
Wind Chill40°F (4°C)
Last update 11 Dec 05:20 AM PST
Extended Forecast for

2 Miles SW Castro Valley CA

  • Today

    Today: Sunny, with a high near 61. East northeast wind around 5 mph becoming calm.

    High: 61 °F

    Sunny

  • Tonight

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

    Low: 44 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 62. East northeast wind around 5 mph becoming calm  in the morning.

    High: 62 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43. East wind around 6 mph.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 65. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 65 °F

    Sunny

  • Saturday Night

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

    Low: 44 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 61. East northeast wind around 5 mph becoming calm.
Tonight
Clear, with a low around 44. East northeast wind around 6 mph.
Friday
Sunny, with a high near 62. East northeast wind around 5 mph becoming calm in the morning.
Friday Night
Mostly clear, with a low around 43. East wind around 6 mph.
Saturday
Sunny, with a high near 65. Calm wind becoming west northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 44.
Sunday
Mostly sunny, with a high near 63.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Partly sunny, with a high near 63.
Monday Night
A slight chance of rain. Mostly cloudy, with a low around 51.
Tuesday
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a high near 64.
Tuesday Night
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 53.
Wednesday
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a high near 63.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Castro Valley CA
 37.69°N 122.1°W (Elev. 174 ft)
2:25 am PST Dec 11, 2025
5am PST Dec 11, 2025-6pm PST Dec 17, 2025
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database