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

3 Miles WNW Castro Valley CA

  • Today

    Today: Sunny, with a high near 63. Calm wind becoming north northeast 5 to 7 mph in the afternoon.

    High: 63 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 44. East northeast wind 3 to 6 mph.

    Low: 44 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 64. Northeast wind 5 to 7 mph.

    High: 64 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43. East wind around 7 mph.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 64. East northeast wind around 5 mph becoming calm.

    High: 64 °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 63. Calm wind becoming north northeast 5 to 7 mph in the afternoon.
Tonight
Clear, with a low around 44. East northeast wind 3 to 6 mph.
Friday
Sunny, with a high near 64. Northeast wind 5 to 7 mph.
Friday Night
Mostly clear, with a low around 43. East wind around 7 mph.
Saturday
Sunny, with a high near 64. East northeast wind around 5 mph becoming calm.
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 50.
Tuesday
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a high near 63.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 52.
Wednesday
A chance of rain. Mostly cloudy, with a high near 63.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Castro Valley CA
 37.73°N 122.11°W (Elev. 397 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

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database