San Clemente Island - Northwest Harbor Weather Forecast

    • 63
    • 71

    Chance Rain Showers

    • 63
    • 67

    Rain Showers Likely

    • 64
    • 69

    Partly Sunny

    • 63
    • 68

    Mostly Cloudy

    • 61
    • 67

    Chance Rain Showers

    • 62
    • 67

    Mostly Sunny

Today 12 Nov Catalina and Santa Barbara Islands

Sunny. Highs in the lower to mid 70s.

Tonight 12 Nov Catalina and Santa Barbara Islands

Partly cloudy in the Evening, then cloudy with a 40 percent chance of Showers after midnight. Lows in the mid 50s to lower 60s.

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San Clemente Island - Northwest Harbor Temperature Statistics

November Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 5 November, 2026

    60.1 °F

  • Average November

    68.7 °F

  • Highest 8 November, 2026

    82 °F

Climate (2021–2026)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2021–2026

    58.1 °F

  • Average 2021–2026

    62.7 °F

  • Average High 2021–2026

    67.1 °F
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