San Clemente Island - Northwest Harbor Weather Forecast

    • 59
    • 68

    Mostly Cloudy

    • 59
    • 67

    Mostly Cloudy

    • 60
    • 67

    Mostly Cloudy

    • 60
    • 67

    Partly Sunny

    • 60
    • 68

    Mostly Cloudy

    • 60
    • 68

    Mostly Cloudy

Today 20 Oct Catalina and Santa Barbara Islands

Areas of low Clouds and fog clearing to the Beaches in the afternoon. Fog locally dense with visibility one quarter mile or less. Highs in the upper 60s and 70s.

Tonight 20 Oct Catalina and Santa Barbara Islands

Low Clouds and fog near the coast early Spreading inland. Lows in the mid 50s to around 60.

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San Clemente Island - Northwest Harbor Temperature Statistics

October Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 17 October, 2025

    53.1 °F

  • Average October

    66.4 °F

  • Highest 3 October, 2025

    73 °F

Climate (2020–Present)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2020–2025

    56.7 °F

  • Average 2020–2025

    61.2 °F

  • Average High 2020–2025

    66 °F
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