San Clemente Island - Northwest Harbor Weather Forecast

    • 57
    • 63

    Partly Sunny

    • 57
    • 62

    Partly Sunny

    • 59
    • 65

    Mostly Cloudy

    • 58
    • 65

    Partly Sunny

    • 58
    • 67

    Partly Sunny

    • 58
    • 67

    Mostly Cloudy

Today 16 May Catalina and Santa Barbara Islands

Areas of low Clouds and fog. Highs in the mid 60s.

Tonight 16 May Catalina and Santa Barbara Islands

Areas of low Clouds and fog. Breezy with Lows in the mid 50s to around 60. West wind 20 to 25 Mph, becoming northeast after midnight.

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San Clemente Island - Northwest Harbor Temperature Statistics

May Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 5 May, 2026

    60.1 °F

  • Average May

    67.4 °F

  • Highest 14 May, 2026

    73.9 °F

Climate (2021–Present)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2021–2026

    57.6 °F

  • Average 2021–2026

    62 °F

  • Average High 2021–2026

    66.4 °F
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