San Clemente Island - Northwest Harbor Weather Forecast

    • 60
    • 67

    Mostly Sunny

    • 58
    • 65

    Partly Sunny

    • 58
    • 64

    Mostly Cloudy

    • 59
    • 65

    Mostly Sunny

    • 61
    • 68

    Mostly Sunny

    • 60
    • 67

    Partly Sunny

Today 31 Jan Catalina and Santa Barbara Islands

Sunny. Highs in the mid to upper 70s.

Tonight 31 Jan Catalina and Santa Barbara Islands

Clear. Lows in the 50s to around 60.

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San Clemente Island - Northwest Harbor Temperature Statistics

January Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 27 January, 2026

    52 °F

  • Average January

    62.3 °F

  • Highest 15 January, 2026

    70 °F

Climate (2021–Present)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2021–2026

    57.1 °F

  • Average 2021–2026

    61.5 °F

  • Average High 2021–2026

    66.1 °F
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