Old Topanga Weather Forecast

    • 57
    • 78

    Increasing Clouds

    • 58
    • 81

    Partly Sunny

    • 59
    • 84

    Mostly Sunny

    • 60
    • 85

    Mostly Sunny

    • 60
    • 87

    Mostly Sunny

    • 62
    • 89

    Mostly Sunny

Today 11 Sep Eastern Santa Monica Mountains Recreational Area

Sunny. Highs in the lower to mid 70s.

Tonight 11 Sep Eastern Santa Monica Mountains Recreational Area

Mostly clear in the evening then cloudy. Lows in the mid 50s to lower 60s.

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Old Topanga Temperature Statistics

September Temperature

Van Nuys, Van Nuys Airport (9.9 miles)

  • Lowest 6 September, 2025

    63 °F

  • Average September

    78.8 °F

  • Highest 2 September, 2025

    99 °F

Climate (2020–Present)

Van Nuys, Van Nuys Airport (9.9 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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