Castaic Weather Forecast

    • 49
    • 82

    Sunny

    • 50
    • 80

    Sunny

    • 49
    • 79

    Sunny

    • 49
    • 78

    Mostly Sunny

    • 48
    • 75

    Sunny

    • 49
    • 76

    Sunny

Today 10 Dec Santa Clarita Valley

Sunny. Highs in the upper 70s to mid 80s. Northeast Winds 15 to 25 Mph.

Tonight 10 Dec Santa Clarita Valley

Clear. Lows in the upper 40s to mid 50s. Northeast Winds 15 to 25 Mph.

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Castaic Temperature Statistics

December Temperature

Van Nuys, Van Nuys Airport (20.5 miles)

  • Lowest 2 December, 2025

    43 °F

  • Average December

    57.3 °F

  • Highest 7 December, 2025

    77 °F

Climate (2020–Present)

Van Nuys, Van Nuys Airport (20.5 miles)

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  • Average Low 2020–2025

    56.5 °F

  • Average 2020–2025

    67.3 °F

  • Average High 2020–2025

    79.3 °F
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