San Clemente Island - Northwest Harbor Weather Forecast

    • 56
    • 65

    Patchy Fog

    • 56
    • 63

    Patchy Fog

    • 56
    • 63

    Partly Sunny

    • 57
    • 64

    Partly Sunny

    • 55
    • 64

    Mostly Cloudy

    • 55
    • 63

    Mostly Cloudy

    • 57
    • 64

    Slight Chance Rain Showers

Today 28 Nov Catalina and Santa Barbara Islands

Sunny. Highs in the mid 60s to around 70.

Tonight 28 Nov Catalina and Santa Barbara Islands

Low Clouds and fog near the coast early Spreading inland. Lows in the mid 40s to mid 50s.

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San Clemente Island - Northwest Harbor Temperature Statistics

November Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 19 November, 2025

    50 °F

  • Average November

    61.5 °F

  • Highest 13 November, 2025

    71.1 °F

Climate (2020–Present)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    61.3 °F

  • Average High 2020–2025

    66 °F
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