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

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

Well below normal temperatures will continue for the eastern half of the Lower 48 this week. Another blast of arctic air will spread from the Plains through the East/Southeast Friday into Saturday with more record lows expected even into Florida. Forecasts are being monitored for increasing potential of another significant winter storm to impact the eastern United States this coming weekend. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

52°F

11°C

Humidity 71%
Wind Speed NE 3 MPH
Barometer 30.29 in (1025.74 mb)
Dewpoint 43°F (6°C)
Visibility 7.00 mi
Last update 27 Jan 09:35 AM PST
Extended Forecast for

Castro Valley CA

  • Today

    Today: Increasing clouds, with a high near 64. South southeast wind 8 to 16 mph becoming southwest in the afternoon.

    High: 64 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 30 percent chance of rain. Mostly cloudy, with a low around 49. South wind 5 to 7 mph becoming calm after midnight. New precipitation amounts of less than a tenth of an inch possible.

    Low: 49 °F

    Chance Rain

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 63. Northeast wind 6 to 8 mph.

    High: 63 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. North northwest wind around 5 mph becoming calm in the evening.

    Low: 43 °F

    Partly Cloudy

  • 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: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly 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 67.

    High: 67 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 64. South southeast wind 8 to 16 mph becoming southwest in the afternoon.
Tonight
A 30 percent chance of rain. Mostly cloudy, with a low around 49. South wind 5 to 7 mph becoming calm after midnight. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 63. Northeast wind 6 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 43. North northwest wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 65. Calm wind becoming north northeast around 6 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 45.
Friday
Partly sunny, with a high near 66.
Friday Night
Mostly cloudy, with a low around 46.
Saturday
Partly sunny, with a high near 67.
Saturday Night
Mostly cloudy, with a low around 48.
Sunday
A slight chance of rain. Partly sunny, with a high near 65.
Sunday Night
A slight chance of rain. Partly cloudy, with a low around 48.
Monday
Mostly sunny, with a high near 66.
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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:
7:33 am PST Jan 27, 2026
Forecast Valid:
9am PST Jan 27, 2026-6pm PST Feb 2, 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