Castaic Weather Forecast

    • 54
    • 80

    Increasing Clouds

    • 54
    • 81

    Partly Sunny

    • 56
    • 83

    Mostly Sunny

    • 56
    • 87

    Mostly Sunny

    • 57
    • 87

    Mostly Sunny

    • 58
    • 87

    Mostly Sunny

Today 10 Sep Santa Clarita Valley

Low Clouds and fog with drizzle in the morning then sunny. Highs in the mid 70s to around 80. Southwest Winds 15 to 25 Mph in the afternoon.

Tonight 10 Sep Santa Clarita Valley

Mostly clear in the evening then Areas of low Clouds and fog. Lows in the mid 50s. Southwest Winds 10 to 20 Mph in the evening.

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Castaic Temperature Statistics

September Temperature

Van Nuys, Van Nuys Airport (20.5 miles)

  • Lowest 6 September, 2025

    63 °F

  • Average September

    79.9 °F

  • Highest 2 September, 2025

    99 °F

Climate (2020–Present)

Van Nuys, Van Nuys Airport (20.5 miles)

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  • Average Low 2020–2025

    56.6 °F

  • Average 2020–2025

    67.6 °F

  • Average High 2020–2025

    79.6 °F
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