Castro Valley Weather Forecast

    • 57
    • 82

    Mostly Sunny

    • 53
    • 79

    Mostly Sunny

    • 55
    • 81

    Sunny

    • 54
    • 82

    Mostly Sunny

    • 56
    • 82

    Mostly Sunny

    • 57
    • 85

    Mostly Sunny

Today 18 May San Francisco Bay Shoreline

Sunny. Highs in the 70s to mid 80s. West Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 18 May San Francisco Bay Shoreline

Mostly clear. Lows in the mid 50s. West Winds 10 to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castro Valley Temperature Statistics

May Temperature

Hayward, Hayward Air Terminal (3.1 miles)

  • Lowest 11 May, 2022

    42.1 °F

  • Average May

    56.8 °F

  • Highest 4 May, 2022

    78.1 °F

Climate (2010–Present)

Hayward, Hayward Air Terminal (3.1 miles)

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  • Average Low 2010–Present

    51.6 °F

  • Average 2010–Present

    58.6 °F

  • Average High 2010–Present

    68.1 °F
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