Powerful Winter Storm from the Upper Midwest into the Northeast; Severe Thunderstorms in the Midwest and Ohio Valley

A rapidly-intensifying storm is expected to bring heavy snow, blizzard conditions, and icing from the Upper Midwest through the Great Lakes and Northeast. Scattered severe thunderstorms may produce severe/damaging wind gusts and a couple of tornadoes across parts of the Midwest and lower Ohio Valley through the evening. Arctic air will expand across the central and southern U.S.. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

55°F

13°C

Humidity 50%
Wind Speed N 0 MPH
Barometer 30.3 in (1026.08 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 28 Dec 11:54 AM PST
Extended Forecast for

Castro Valley CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 56. North northeast wind around 6 mph.

    High: 56 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 37. East northeast wind 3 to 5 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57. East northeast wind around 7 mph.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36. Light east northeast wind.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Patchy frost before 7am.  Otherwise, sunny, with a high near 57. East northeast wind around 6 mph.

    High: 57 °F

    Patchy Frost
    then Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 10 percent chance of rain after 4pm.  Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: A chance of rain, mainly after 10pm.  Mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance Rain

  • New Year's Day

    New Year's Day: Rain likely, mainly between 10am and 4pm.  Mostly cloudy, with a high near 56.

    High: 56 °F

    Rain Likely

Detailed Forecast

This Afternoon
Sunny, with a high near 56. North northeast wind around 6 mph.
Tonight
Mostly clear, with a low around 37. East northeast wind 3 to 5 mph.
Monday
Sunny, with a high near 57. East northeast wind around 7 mph.
Monday Night
Mostly clear, with a low around 36. Light east northeast wind.
Tuesday
Patchy frost before 7am. Otherwise, sunny, with a high near 57. East northeast wind around 6 mph.
Tuesday Night
Partly cloudy, with a low around 39.
Wednesday
A 10 percent chance of rain after 4pm. Partly sunny, with a high near 56.
Wednesday Night
A chance of rain, mainly after 10pm. Mostly cloudy, with a low around 44.
New Year's Day
Rain likely, mainly between 10am and 4pm. Mostly cloudy, with a high near 56.
Thursday Night
Rain likely, mainly after 10pm. Mostly cloudy, with a low around 48.
Friday
Rain likely. Mostly cloudy, with a high near 58.
Friday Night
A chance of rain. Mostly cloudy, with a low around 48.
Saturday
A chance of rain. Mostly cloudy, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.69°N 122.05°W (Elev. 364 ft)
6:40 am PST Dec 28, 2025
12pm PST Dec 28, 2025-6pm PST Jan 3, 2026
 
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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