National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Late January Extreme Cold; Watching East Coast Storm Threat This Weekend

The next blast of Arctic air surges south down the Plains, across the Great Lakes and through the Southeast and East Friday through Saturday. This could be longest duration of cold in several decades. Forecast models are being closely monitored for potential of another significant winter storm to impact the eastern United States this coming weekend. Confidence in coastal impacts has increased. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Rain

55°F

13°C

Humidity 76%
Wind Speed N 0 MPH
Barometer 30.36 in (1028.11 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 28 Jan 03:20 AM PST
Extended Forecast for

Castro Valley CA

  • Overnight

    Overnight: A 40 percent chance of rain. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 50. Calm wind.

    Low: 50 °F

    Chance Rain
    and Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 7am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 62. North wind around 6 mph.

    High: 62 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 65. Calm wind becoming north northeast around 6 mph in the afternoon.

    High: 65 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 45. Calm wind.

    Low: 45 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 68.

    High: 68 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 40 percent chance of rain. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 50. Calm wind.
Wednesday
Patchy fog before 7am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 62. North wind around 6 mph.
Wednesday Night
Mostly clear, with a low around 42. Calm wind.
Thursday
Mostly sunny, with a high near 65. Calm wind becoming north northeast around 6 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 45. Calm wind.
Friday
Partly sunny, with a high near 66.
Friday Night
Mostly cloudy, with a low around 46.
Saturday
Partly sunny, with a high near 68.
Saturday Night
Mostly cloudy, with a low around 47.
Sunday
A chance of rain, mainly after 4pm. Partly sunny, with a high near 65.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 49.
Monday
Mostly sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Sunny, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.69°N 122.05°W (Elev. 364 ft)
Last Update:
12:26 am PST Jan 28, 2026
Forecast Valid:
3am PST Jan 28, 2026-6pm PST Feb 3, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation