San Clemente Island - Northwest Harbor Weather Forecast

    • 59
    • 68

    Mostly Sunny

    • 59
    • 67

    Mostly Sunny

    • 58
    • 66

    Mostly Sunny

    • 57
    • 65

    Partly Sunny

    • 56
    • 64

    Mostly Cloudy

    • 56
    • 63

    Partly Sunny

Today 9 Dec Catalina and Santa Barbara Islands

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

Tonight 9 Dec Catalina and Santa Barbara Islands

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

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San Clemente Island - Northwest Harbor Temperature Statistics

December Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 2 December, 2025

    50 °F

  • Average December

    61.2 °F

  • Highest 4 December, 2025

    66 °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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