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      Coastal Flood Advisory
      until 4:00 PM PST
      Elev undefined ft, undefined °undefined undefined °undefined

      Castro Valley, CA

      Station57°
      Updated: 8:36 AM PST on November 8, 2026 (GMT -8)
      7 minutes ago
      71°
      53°
      57
      Feels Like 57
      Mostly Cloudy
      N
      4
      Lower temperature is expected today
      Wundermap

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       Wundermap
      50
      50
      575
      90
      50
      7
      0 mph
      50
      50
      50
      50
      50
      50
      Now
        Hyper-local data from Weather Underground's network of
        400,000+ personal weather stations worldwide
        Today
        Mon 11/09
        High 71°f
         15% Precip. / 0 in
        A mix of clouds and sun during the morning will give way to cloudy skies this afternoon. High 71F. Winds W at 5 to 10 mph.
        Tonight
        Mon 11/09
        Low 53°f
         20% Precip. / 0 in
        Partly cloudy skies. Low 53F. Winds light and variable.
        Tomorrow
        Tue 11/10
        High 72°f54°f
         8% Precip. / 0 in
        Cloudy skies early will become partly cloudy later in the day. High 72F. Winds WNW at 5 to 10 mph.
        Hourly Forecast
        Now
        57°
        9AM
        58°
        10AM
        60°
        11AM
        63°
        12PM
        66°
        1PM
        68°
        2PM
        69°
        3PM
        70°
        4PM
        69°
        5PM
        66°
        5:02PM
        Sunset
        6PM
        63°
        7PM
        61°
        8PM
        60°
        9PM
        58°
        10PM
        57°
        11PM
        56°
        12AM
        55°
        1AM
        55°
        2AM
        55°
        3AM
        54°
        4AM
        55°
        5AM
        55°
        6AM
        54°
        6:42AM
        Sunrise
        7AM
        54°
        8AM
        56°
        Precipitation
        21%
        Pollen
        Ragweed Pollen
        Low
        Air Quality
        54
        Moderate
        UV Index
        1
        Low
        Additional Conditions
        1. Pressure 30.16 in
        2. Visibility 8 miles
        3. Clouds Cloudy
        4. Dew Point53°F
        5. Humidity 87%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KHWD Station History
        Almanac for November 8, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 71°F 67°F 82°F 1955
        4. Low 53°F 49°F 35°F 1947
        5. Rain/Snow Depth
        6. Precipitation 0 in 4.7 in -
        7. Snow 0 in 0.1 in -
        Almanac for November 9, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 72°F 67°F 82°F
        4. Low 53°F 49°F 34°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:41 AM 5:02 PM
        3. Civil Twilight 6:13 AM 5:30 PM
        4. Nautical Twilight 5:42 AM 6:01PM
        5. Astronomical Twilight 5:11 AM 6:32 PM
        1. Length of Visible Light 11h 16m
        2. Length of Day 10h 21m
        3. Tomorrow will be 1 minute 58 seconds shorter
        1. Moon 6:15 AM 4:25 PM
        2. New0% of the Moon is Illuminated
        Nov 8
        New Moon
        Nov 17
        Waxing Half First Qtr
        Nov 24
        Full Moon
        Nov 30
        Waning Half Last Qtr
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