Castaic Junction Weather Forecast

    • 56
    • 82

    Decreasing Clouds

    • 55
    • 82

    Mostly Sunny

    • 57
    • 85

    Sunny

    • 60
    • 89

    Mostly Sunny

    • 59
    • 87

    Mostly Sunny

    • 58
    • 85

    Mostly Sunny

Today 16 Sep Santa Clarita Valley

Low Clouds and fog with drizzle in the morning then partly cloudy. Highs in the mid 70s to around 80. South Winds 10 to 20 Mph in the afternoon.

Tonight 16 Sep Santa Clarita Valley

Partly cloudy in the evening then mostly cloudy. Lows in the mid 50s.

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Castaic Junction Temperature Statistics

September Temperature

Van Nuys, Van Nuys Airport (16.8 miles)

  • Lowest 2 September, 2026

    60.7 °F

  • Average September

    78.3 °F

  • Highest 9 September, 2026

    107.7 °F

Climate (2021–2026)

Van Nuys, Van Nuys Airport (16.8 miles)

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  • Average Low 2021–2026

    56.6 °F

  • Average 2021–2026

    67.7 °F

  • Average High 2021–2026

    79.5 °F
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