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    • Early AM

      Oct 1

      52° Lo
      Low clouds
      • Stargazing
      • Weather
      • Cloud Cover: 66%
      • Precip: 6%
      • Hours of Precip: 0
      More
    • Today

      Oct 1

      70° /54°
      Low clouds, then sun and cool
      • Good
      • for stargazing
      • Cloud Cover: 60%
      • Precip: 15%
      • Hours of Precip: 0
      More
    • Sun

      Oct 2

      66° /50°
      A p.m. shower in places
      • Good
      • for stargazing
      • Cloud Cover: 39%
      • Precip: 8%
      • Hours of Precip: 1
      More
    • Mon

      Oct 3

      66° /57°F
      Partly sunny and cool
      • Good
      • for stargazing
      • Cloud Cover: 88%
      • Precip: 25%
      • Hours of Precip: 0
    • Tue

      Oct 4

      70° /50°
      Partly sunny
      • Very Good
      • for stargazing
      • Cloud Cover: 53%
      • Precip: 4%
      • Hours of Precip: 0
      More
    62°/59° RealFeel® 61°/59°
    Variable cloudiness
    • 5 mph
    • Precipitation: 25%
    • Rain: 0 in
    • Snow: 0 in
    • Humidity: 60%
    • Cloud Cover: 90%
    • Dew Point: 46° F
    • Visibility: 10 mi

    Temperature History

    more Historical Weather Data >
      Today Normal Record 10/3/2015
    High 66° 76° N/A 75°
    Low 57° 55° N/A 51°

    Sunrise/Sunset

    • Sunrise: 7:06 AM
    • Sunset: 6:47 PM
    • Duration: 11:41 hr

    Moonrise/Moonset

    • Moonrise: 9:29 AM
    • Moonset: 8:35 PM
    • Duration: 11:06 hr
    Astronomy

    Solunar Information for Castro Valley, CA

    Sat, Oct 1
    New
    Sun, Oct 9
    First
    Sun, Oct 16
    Full
    Sat, Oct 22
    Last

    Castro Valley Weather Report

    Cooler air, showers to aid in wildfire efforts across California this weekend

    September 30, 2016; 11:04 PM ET

    Improving weather over the next several days will aid officials in battling wildfires across California. More >

    Mon. Stargazing