Castaic Lake Weather Forecast

    • 64
    • 83

    Sunny

    • 67
    • 88

    Mostly Sunny

    • 59
    • 84

    Partly Sunny

    • 59
    • 81

    Mostly Sunny

    • 62
    • 87

    Sunny

    • 64
    • 89

    Mostly Sunny

Today 18 Sep Santa Clarita Valley

Sunny. Highs in the upper 70s to mid 80s.

Tonight 18 Sep Santa Clarita Valley

Clear. Lows in the upper 50s to mid 60s.

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Castaic Lake Temperature Statistics

September Temperature

Los Angeles, Whiteman Airport (22.4 miles)

  • Lowest 1 September, 2026

    64.4 °F

  • Average September

    80.9 °F

  • Highest 9 September, 2026

    104 °F

Climate (2021–2026)

Los Angeles, Whiteman Airport (22.4 miles)

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  • Average Low 2021–2026

    60.5 °F

  • Average 2021–2026

    70.4 °F

  • Average High 2021–2026

    76.5 °F
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