Topanga Weather Forecast

    • 60
    • 84

    Rain Showers Likely

    • 61
    • 80

    Chance Rain Showers

    • 61
    • 83

    Mostly Sunny

    • 61
    • 83

    Mostly Sunny

    • 62
    • 85

    Partly Sunny

    • 61
    • 84

    Mostly Sunny

    • 62
    • 84

    Sunny

Today 18 Sep Eastern Santa Monica Mountains Recreational Area

Showers with a slight chance of Thunderstorms in the Morning, then a chance of Showers with a slight chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall. Highs in the mid 70s to mid 80s.

Tonight 18 Sep Eastern Santa Monica Mountains Recreational Area

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the Evening, then a slight chance of Showers and Thunderstorms after midnight. Lows in the 60s to lower 70s. Chance of precipitation 30 percent.

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Topanga Temperature Statistics

September Temperature

Santa Monica, Santa Monica Municipal Airport (9.9 miles)

  • Lowest 11 September, 2025

    63 °F

  • Average September

    70.2 °F

  • Highest 2 September, 2025

    80.1 °F

Climate (2020–Present)

Santa Monica, Santa Monica Municipal Airport (9.9 miles)

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  • Average Low 2020–2025

    55.8 °F

  • Average 2020–2025

    62.4 °F

  • Average High 2020–2025

    69.7 °F
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