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

Heavy Snow in the Cascades and Northern Rockies; Wintry Mix in the Northeast; High Winds in Southern California

Two more cold fronts will pass through the Northwest U.S. this week with heavy mountain snow continuing across the Cascades, and northern Rockies. A quick moving storm system will bring mixed precipitation including some freezing rain across the Northeast U.S. today. High winds could blow down trees and power lines in the mountains of southern California this evening through Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

58°F

14°C

Humidity 69%
Wind Speed W 11 MPH
Barometer 30.05 in (1017.61 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 07 Jan 12:54 PM PST
Extended Forecast for

Castro Valley CA

Extreme Cold Watch January 9, 01:00am until January 9, 09:00am
Click here for hazard details and duration
Extreme Cold Watch

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 56. West wind around 10 mph.

    High: 56 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 41. West wind around 10 mph, with gusts as high as 23 mph.

    Low: 41 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 54. North wind around 9 mph, with gusts as high as 18 mph.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 36. North northeast wind around 6 mph.

    Low: 36 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 53. Northeast wind around 7 mph.

    High: 53 °F

    Sunny

  • Friday Night

    Friday Night: Patchy frost after 2am. Otherwise, mostly clear, with a low around 35.

    Low: 35 °F

    Clear then
    Patchy Frost

  • Saturday

    Saturday: Areas of frost before 8am. Otherwise, mostly sunny, with a high near 56.

    High: 56 °F

    Areas Frost
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 57.

    High: 57 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 56. West wind around 10 mph.
Tonight
Partly cloudy, with a low around 41. West wind around 10 mph, with gusts as high as 23 mph.
Thursday
Sunny, with a high near 54. North wind around 9 mph, with gusts as high as 18 mph.
Thursday Night
Mostly clear, with a low around 36. North northeast wind around 6 mph.
Friday
Sunny, with a high near 53. Northeast wind around 7 mph.
Friday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 35.
Saturday
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 56.
Saturday Night
Mostly cloudy, with a low around 38.
Sunday
Partly sunny, with a high near 57.
Sunday Night
Partly cloudy, with a low around 39.
Monday
Sunny, with a high near 59.
Monday Night
Mostly clear, with a low around 41.
Tuesday
Sunny, with a high near 61.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.72°N 122.05°W (Elev. 397 ft)
Last Update:
12:26 pm PST Jan 7, 2026
Forecast Valid:
1pm PST Jan 7, 2026-6pm PST Jan 13, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

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Chance of Precipitation