Areas of Dangerous Heat and Severe Thunderstorms

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week before returning over much of the Plains into next week. Scattered strong to severe thunderstorms are possible across parts of the Northeast U.S. on Thursday. Damaging wind, hail, and a tornado or two are possible. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

64°F

18°C

Humidity 82%
Wind Speed N 0 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 59°F (15°C)
Visibility 9.00 mi
Last update 26 Aug 11:35 PM PDT
Extended Forecast for

Castro Valley CA

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 4am.  Mostly clear, with a low around 61. Light south southeast wind.

    Low: 61 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 11am, then a slight chance of rain after 11am.  Increasing clouds, with a high near 81. Calm wind becoming southwest 5 to 8 mph in the morning.  Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    T-storms then
    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain.  Mostly cloudy, with a low around 61. South southwest wind 5 to 7 mph.

    Low: 61 °F

    Slight Chance
    Rain

  • Friday

    Friday: A 20 percent chance of rain.  Cloudy, with a high near 74. Calm wind becoming west southwest 5 to 8 mph in the afternoon.

    High: 74 °F

    Slight Chance
    Rain

  • Friday Night

    Friday Night: Partly cloudy, with a low around 57. Southwest wind 5 to 8 mph.

    Low: 57 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 61. Light south southeast wind.
Thursday
A slight chance of showers and thunderstorms before 11am, then a slight chance of rain after 11am. Increasing clouds, with a high near 81. Calm wind becoming southwest 5 to 8 mph in the morning. Chance of precipitation is 20%.
Thursday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 61. South southwest wind 5 to 7 mph.
Friday
A 20 percent chance of rain. Cloudy, with a high near 74. Calm wind becoming west southwest 5 to 8 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 57. Southwest wind 5 to 8 mph.
Saturday
Mostly sunny, with a high near 71.
Saturday Night
Partly cloudy, with a low around 56.
Sunday
Mostly sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 55.
Monday
Partly sunny, with a high near 68.
Monday Night
Partly cloudy, with a low around 55.
Tuesday
Partly sunny, with a high near 70.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
A slight chance of rain. Mostly sunny, with a high near 74.
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.71°N 122.08°W (Elev. 397 ft)
11:26 pm PDT Aug 26, 2026
11pm PDT Aug 26, 2026-6pm PDT Sep 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database