San Clemente Island - Northwest Harbor Weather Forecast

    • 60
    • 72

    Partly Sunny

    • 60
    • 72

    Mostly Sunny

    • 60
    • 73

    Mostly Sunny

    • 60
    • 70

    Patchy Fog

    • 59
    • 68

    Patchy Fog

    • 59
    • 68

    Partly Sunny

Today 17 Mar Catalina and Santa Barbara Islands

Sunny. Highs in the upper 70s and 80s.

Tonight 17 Mar Catalina and Santa Barbara Islands

Mostly clear. Lows in the upper 50s and 60s.

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San Clemente Island - Northwest Harbor Temperature Statistics

March Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 11 March, 2026

    54 °F

  • Average March

    65.4 °F

  • Highest 13 March, 2026

    78.8 °F

Climate (2021–Present)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2021–2026

    57.3 °F

  • Average 2021–2026

    61.7 °F

  • Average High 2021–2026

    66.2 °F
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