Castle Rock State Park Weather Forecast

    • 61
    • 82

    Partly Sunny

    • 58
    • 79

    Mostly Sunny

    • 59
    • 79

    Mostly Sunny

    • 61
    • 81

    Partly Sunny

    • 59
    • 79

    Partly Sunny

    • 60
    • 80

    Partly Sunny

Today 20 Aug Santa Cruz Mountains

Mostly cloudy in the morning then becoming partly cloudy. Highs in the upper 60s to lower 80s. West Winds up to 5 Mph.

Tonight 20 Aug Santa Cruz Mountains

Mostly cloudy. Lows in the 50s to mid 60s. Northwest Winds up to 5 Mph.

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  • Temperature Real-Time

Castle Rock State Park Temperature Statistics

August Temperature

San Jose, San Jose International Airport (13.7 miles)

  • Lowest 4 August, 2026

    58.6 °F

  • Average August

    70.8 °F

  • Highest 3 August, 2026

    91.7 °F

Climate (2021–2026)

San Jose, San Jose International Airport (13.7 miles)

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  • Average Low 2021–2026

    52.3 °F

  • Average 2021–2026

    62.1 °F

  • Average High 2021–2026

    72.8 °F
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