San Clemente Island - Northwest Harbor Weather Forecast

    • 60
    • 68

    Increasing Clouds

    • 59
    • 69

    Patchy Fog

    • 60
    • 71

    Partly Sunny

    • 60
    • 72

    Mostly Cloudy

    • 60
    • 68

    Mostly Cloudy

    • 60
    • 67

    Mostly Cloudy

    • 58
    • 67

    Chance Rain Showers

Today 7 Nov Catalina and Santa Barbara Islands

Low Clouds and fog clearing to the Beaches in the afternoon. Highs in the lower to mid 70s.

Tonight 7 Nov Catalina and Santa Barbara Islands

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

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San Clemente Island - Northwest Harbor Temperature Statistics

November Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 4 November, 2025

    55.4 °F

  • Average November

    61 °F

  • Highest 5 November, 2025

    66 °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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