San Clemente Island - Northwest Harbor Weather Forecast

    • 58
    • 65

    Decreasing Clouds

    • 59
    • 68

    Mostly Sunny

    • 58
    • 69

    Partly Sunny

    • 58
    • 65

    Partly Sunny

    • 58
    • 64

    Partly Sunny

    • 58
    • 64

    Partly Sunny

Today 16 Apr Catalina and Santa Barbara Islands

Mostly cloudy. Highs in the mid 60s to lower 70s.

Tonight 16 Apr Catalina and Santa Barbara Islands

Partly cloudy in the evening then mostly clear. Lows in the upper 40s and 50s.

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San Clemente Island - Northwest Harbor Temperature Statistics

April Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 3 April, 2026

    58.6 °F

  • Average April

    65.2 °F

  • Highest 9 April, 2026

    71.1 °F

Climate (2021–Present)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2021–2026

    57.4 °F

  • Average 2021–2026

    61.8 °F

  • Average High 2021–2026

    66.3 °F
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