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

Critical Fire Weather Conditions in the Plains; Heavy Snow in the Sierra and Northern Rockies

Gusty winds and warm, very dry conditions will lead to a Critical Risk of fire weather across much of the High Plains through Thursday. A Pacific storm system will bring strong winds and precipitation from the Pacific Northwest to the Northern Rockies, with heavy mountain snow in the Sierra-Nevada and northern Rockies. Heavy snow will continue in the northern Rockies on Thursday. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Mostly Cloudy

55°F

13°C

Humidity 93%
Wind Speed SE 11 MPH
Barometer 30.18 in (1022.01 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 22 Apr 10:20 AM PDT
Extended Forecast for

Castro Valley CA

  • Today

    Today: A chance of rain and thunderstorms before 3pm, then a slight chance of rain between 3pm and 4pm. Partly sunny, with a high near 64. Southeast wind around 7 mph becoming west northwest in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F

    Chance Rain

  • Tonight

    Tonight: Mostly clear, with a low around 46. West northwest wind around 6 mph becoming calm in the evening.

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 69. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 49. Southwest wind 5 to 9 mph.

    Low: 49 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy, with a high near 66. Calm wind becoming west 5 to 8 mph in the afternoon.

    High: 66 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of rain and thunderstorms before 3pm, then a slight chance of rain between 3pm and 4pm. Partly sunny, with a high near 64. Southeast wind around 7 mph becoming west northwest in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Mostly clear, with a low around 46. West northwest wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 69. Calm wind becoming west 5 to 7 mph in the afternoon.
Thursday Night
Increasing clouds, with a low around 49. Southwest wind 5 to 9 mph.
Friday
Mostly cloudy, with a high near 66. Calm wind becoming west 5 to 8 mph in the afternoon.
Friday Night
Mostly cloudy, with a low around 50.
Saturday
Partly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Mostly sunny, with a high near 65.
Sunday Night
Partly cloudy, with a low around 48.
Monday
Partly sunny, with a high near 67.
Monday Night
Mostly cloudy, with a low around 48.
Tuesday
Mostly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.72°N 122.05°W (Elev. 397 ft)
Last Update:
2:42 am PDT Apr 22, 2026
Forecast Valid:
10am PDT Apr 22, 2026-6pm PDT Apr 28, 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

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation