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      Coastal Flood Advisory
      until 6:00 PM PDT
      Elev undefined ft, undefined °undefined undefined °undefined

      Castro Valley, CA

      Station66°
      Updated: 5:35 PM PDT on October 28, 2026 (GMT -7)
      7 minutes ago
      71°
      46°
      66
      Feels Like 66
      Partly Cloudy
      N
      9
      Similar temperature is expected tomorrow
      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
        Tonight
        Thu 10/29
        Low 49°f
         5% Precip. / 0 in
        Partly cloudy early with increasing clouds overnight. Low 49F. Winds NE at 5 to 10 mph.
        Tomorrow
        Fri 10/30
        High 69°f
         4% Precip. / 0 in
        Cloudy. High 69F. Winds W at 5 to 10 mph.
        Tomorrow night
        Fri 10/30
        Low 51°f
         8% Precip. / 0 in
        Cloudy skies early, followed by partial clearing. Low 51F. Winds SW at 5 to 10 mph.
        Hourly Forecast
        Now
        66°
        6PM
        65°
        6:14PM
        Sunset
        7PM
        61°
        8PM
        58°
        9PM
        56°
        10PM
        55°
        11PM
        53°
        12AM
        52°
        1AM
        52°
        2AM
        51°
        3AM
        51°
        4AM
        50°
        5AM
        50°
        6AM
        50°
        7AM
        50°
        7:30AM
        Sunrise
        8AM
        50°
        9AM
        54°
        10AM
        58°
        11AM
        61°
        12PM
        63°
        1PM
        65°
        2PM
        67°
        3PM
        67°
        4PM
        67°
        5PM
        66°
        Precipitation
        5%
        Pollen
        Ragweed Pollen
        Low
        Air Quality
        24
        Good
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.96 in
        2. Visibility 9 miles
        3. Clouds Partly Cloudy
        4. Dew Point46°F
        5. Humidity 48%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KHWD Station History
        Almanac for October 28, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 71°F 71°F 90°F 2019
        4. Low 46°F 52°F 34°F 1946
        5. Rain/Snow Depth
        6. Precipitation 0 in 4.2 in -
        7. Snow 0 in 0 in -
        Almanac for October 29, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 69°F 70°F 89°F
        4. Low 49°F 51°F 33°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 7:29 AM 6:14 PM
        3. Civil Twilight 7:02 AM 6:40 PM
        4. Nautical Twilight 6:31 AM 7:11PM
        5. Astronomical Twilight 6:01 AM 7:42 PM
        1. Length of Visible Light 11h 38m
        2. Length of Day 10h 44m
        3. Tomorrow will be 2 minutes 10 seconds shorter
        1. Moon 8:01 PM 10:42 AM
        2. Waning Gibbous88% of the Moon is Illuminated
        Nov 1
        Waning Half Last Qtr
        Nov 8
        New Moon
        Nov 17
        Waxing Half First Qtr
        Nov 24
        Full Moon
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