Castle Rock State Park Weather Forecast

    • 65
    • 92

    Increasing Clouds

    • 63
    • 81

    Chance Rain Showers

    • 62
    • 81

    Chance Rain Showers

    • 62
    • 83

    Mostly Sunny

    • 65
    • 86

    Sunny

    • 65
    • 87

    Slight Chance Rain Showers

Today 17 Sep Santa Cruz Mountains

Sunny. Highs in the 80s to lower 90s. Light Winds. Becoming northwest around 5 Mph in the afternoon.

Tonight 17 Sep Santa Cruz Mountains

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 50s to mid 60s. Northwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Rock State Park Temperature Statistics

September Temperature

San Jose, San Jose International Airport (13.7 miles)

  • Lowest 3 September, 2025

    60.1 °F

  • Average September

    68.6 °F

  • Highest 1 September, 2025

    89.1 °F

Climate (2020–Present)

San Jose, San Jose International Airport (13.7 miles)

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  • Average Low 2020–2025

    51.8 °F

  • Average 2020–2025

    61.6 °F

  • Average High 2020–2025

    72.6 °F
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