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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 37.69°N 122.07°W (Text-Only)
NWS Forecast for: Castro Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Last Update: 1:26 pm PDT Jun 29, 2026		Print

  • Tonight

    Tonight: Mostly clear, with a low around 56. Southwest wind 3 to 6 mph.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. Light southwest wind becoming west 5 to 10 mph in the morning.

    High: 77 °F

    Sunny

  • Tuesday
    Night

    Tuesday Night: Increasing clouds, with a low around 55. South southwest wind 7 to 10 mph.

    Low: 55 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 74. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.

    High: 74 °F

    Decreasing
    Clouds

  • Wednesday
    Night

    Wednesday Night: Partly cloudy, with a low around 55. South southwest wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Thursday
    Night

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

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Friday
    Night

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

    Low: 56 °F

    Partly Cloudy

    • Tonight: Mostly clear, with a low around 56. Southwest wind 3 to 6 mph.

    Tuesday: Sunny, with a high near 77. Light southwest wind becoming west 5 to 10 mph in the morning.

    Tuesday Night: Increasing clouds, with a low around 55. South southwest wind 7 to 10 mph.

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 74. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.

    Wednesday Night: Partly cloudy, with a low around 55. South southwest wind 10 to 13 mph, with gusts as high as 22 mph.

    Thursday: Mostly sunny, with a high near 72.

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

    Friday: Mostly sunny, with a high near 76.

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

    Independence Day: Mostly sunny, with a high near 76.

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

    Sunday: Mostly sunny, with a high near 75.

    Sunday Night: Mostly cloudy, with a low around 56.

    Monday: Mostly sunny, with a high near 73.


    Castro Valley CA
     37.69°N 122.07°W (Elev. 197 ft)

    Visit your local NWS office at: https://www.weather.gov/mtr