Forecast

    Forecast for Castro Valley, CA | Forecast Periods: 14
    Monday
    Mar 16
    2026

    Castro Valley, CA

    Updated: 1:25 PM PDT

    88°F

    Sunny

    6 mph N
    Precipitation: 0%

    Sunny. High near 88, with temperatures falling to around 86 in the afternoon. North wind around 6 mph.

    Hourly Forecast

    MON14:00
    85°F
    Sunny
    Dewpoint:9.4°Precip:0%Humidity:29%Wind:6 mph NNE
    MON15:00
    87°F
    Sunny
    Dewpoint:10.6°Precip:0%Humidity:29%Wind:6 mph N
    MON16:00
    86°F
    Sunny
    Dewpoint:10°Precip:0%Humidity:29%Wind:6 mph N
    TUE17:00
    86°F
    Sunny
    Dewpoint:10.6°Precip:0%Humidity:31%Wind:6 mph NNW
    TUE18:00
    84°F
    Mostly Clear
    Dewpoint:12.2°Precip:0%Humidity:36%Wind:5 mph NW
    TUE19:00
    78°F
    Mostly Clear
    Dewpoint:12.2°Precip:0%Humidity:43%Wind:5 mph WNW
    TUE20:00
    74°F
    Mostly Clear
    Dewpoint:12.2°Precip:0%Humidity:51%Wind:3 mph WNW
    TUE21:00
    71°F
    Clear
    Dewpoint:12.2°Precip:0%Humidity:54%Wind:3 mph NNW
    TUE22:00
    69°F
    Clear
    Dewpoint:11.7°Precip:0%Humidity:57%Wind:2 mph NNE
    TUE23:00
    68°F
    Mostly Clear
    Dewpoint:11.1°Precip:0%Humidity:56%Wind:2 mph ENE
    TUE00:00
    67°F
    Mostly Clear
    Dewpoint:11.1°Precip:0%Humidity:58%Wind:2 mph SE
    TUE01:00
    66°F
    Clear
    Dewpoint:10.6°Precip:0%Humidity:58%Wind:2 mph SE
    TUE02:00
    65°F
    Clear
    Dewpoint:10°Precip:0%Humidity:60%Wind:2 mph ESE
    TUE03:00
    62°F
    Clear
    Dewpoint:9.4°Precip:0%Humidity:61%Wind:2 mph E
    TUE04:00
    62°F
    Clear
    Dewpoint:8.9°Precip:0%Humidity:61%Wind:2 mph E
    TUE05:00
    61°F
    Clear
    Dewpoint:8.9°Precip:0%Humidity:62%Wind:2 mph ENE
    TUE06:00
    60°F
    Sunny
    Dewpoint:7.8°Precip:0%Humidity:62%Wind:2 mph ENE
    TUE07:00
    61°F
    Sunny
    Dewpoint:8.9°Precip:0%Humidity:63%Wind:2 mph ENE
    TUE08:00
    62°F
    Sunny
    Dewpoint:9.4°Precip:0%Humidity:63%Wind:2 mph NE
    TUE09:00
    65°F
    Sunny
    Dewpoint:10.6°Precip:0%Humidity:61%Wind:2 mph NE
    TUE10:00
    72°F
    Sunny
    Dewpoint:12.8°Precip:0%Humidity:56%Wind:3 mph NE
    TUE11:00
    77°F
    Sunny
    Dewpoint:13.3°Precip:0%Humidity:49%Wind:5 mph NE
    TUE12:00
    82°F
    Sunny
    Dewpoint:13.3°Precip:0%Humidity:40%Wind:5 mph NE
    TUE13:00
    86°F
    Sunny
    Dewpoint:13.9°Precip:0%Humidity:37%Wind:6 mph NE

    Extended Forecast

    Tonight

    Tue, Mar 17
    58°F
    Mostly Clear
    5 mph NE
    Precipitation: 0%
    Mostly clear. Low around 58, with temperatures rising to around 61 overnight. Northeast wind around 5 mph.

    Tuesday

    Tue, Mar 17
    91°F
    Sunny
    2 mph NE
    Precipitation: 0%
    Sunny, with a high near 91. Northeast wind 2 to 6 mph.

    Tuesday Night

    Wed, Mar 18
    60°F
    Mostly Clear
    5 mph NNE
    Precipitation: 0%
    Mostly clear, with a low around 60. North northeast wind around 5 mph.

    Wednesday

    Wed, Mar 18
    92°F
    Sunny
    2 mph NNE
    Precipitation: 0%
    Sunny, with a high near 92. North northeast wind 2 to 6 mph.

    Wednesday Night

    Thu, Mar 19
    61°F
    Clear
    2 mph WSW
    Precipitation: 0%
    Clear, with a low around 61.

    Thursday

    Thu, Mar 19
    92°F
    Sunny
    2 mph NNE
    Precipitation: 0%
    Sunny, with a high near 92.

    Thursday Night

    Fri, Mar 20
    62°F
    Clear
    2 mph WNW
    Precipitation: 0%
    Clear, with a low around 62.

    Friday

    Fri, Mar 20
    93°F
    Sunny
    2 mph NNW
    Precipitation: 0%
    Sunny, with a high near 93.

    Friday Night

    Sat, Mar 21
    61°F
    Mostly Clear
    7 mph W
    Precipitation: 0%
    Mostly clear, with a low around 61.

    Saturday

    Sat, Mar 21
    85°F
    Mostly Sunny
    5 mph W
    Precipitation: 0%
    Mostly sunny, with a high near 85.

    Saturday Night

    Sun, Mar 22
    55°F
    Partly Cloudy
    6 mph WSW
    Precipitation: 2%
    Partly cloudy, with a low around 55.

    Sunday

    Sun, Mar 22
    77°F
    Mostly Sunny
    6 mph WSW
    Precipitation: 2%
    Mostly sunny, with a high near 77.

    Sunday Night

    Mon, Mar 23
    52°F
    Partly Cloudy
    6 mph WSW
    Precipitation: 2%
    Partly cloudy, with a low around 52.

    Display Settings