Castle Rock State Park Weather Forecast

    • 52
    • 77

    Mostly Sunny

    • 53
    • 70

    Partly Sunny

    • 50
    • 68

    Partly Sunny

    • 50
    • 66

    Partly Sunny

    • 48
    • 66

    Mostly Sunny

    • 51
    • 71

    Mostly Sunny

Today 22 May Santa Cruz Mountains

Sunny. Highs near 70. Southwest Winds 5 to 10 Mph.

Tonight 22 May Santa Cruz Mountains

Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the lower 50s. South Winds 5 to 10 Mph.

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  • Temperature Real-Time

Castle Rock State Park Temperature Statistics

May Temperature

San Jose, San Jose International Airport (13.7 miles)

  • Lowest 4 May, 2026

    48.7 °F

  • Average May

    63.9 °F

  • Highest 19 May, 2026

    86 °F

Climate (2021–Present)

San Jose, San Jose International Airport (13.7 miles)

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  • Average Low 2021–2026

    52.2 °F

  • Average 2021–2026

    61.9 °F

  • Average High 2021–2026

    72.7 °F
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