San Clemente Island - Northwest Harbor Weather Forecast

    • 58
    • 68

    Increasing Clouds

    • 58
    • 66

    Partly Sunny

    • 58
    • 65

    Mostly Cloudy

    • 60
    • 67

    Patchy Fog

    • 60
    • 67

    Patchy Fog

    • 59
    • 68

    Patchy Fog

    • 60
    • 68

    Partly Sunny

Today 5 Jul Catalina and Santa Barbara Islands

Partly cloudy except for patchy low Clouds and fog in the morning. Highs from around 70 near the coast to the mid to upper 70s interior.

Tonight 5 Jul Catalina and Santa Barbara Islands

Mostly clear in the evening then low Clouds and fog. Lows in the mid to upper 50s.

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San Clemente Island - Northwest Harbor Temperature Statistics

July Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 1 July, 2025

    57 °F

  • Average July

    60.3 °F

  • Highest 1 July, 2025

    64.9 °F

Climate (2020–Present)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2020–2025

    56.9 °F

  • Average 2020–2025

    61.4 °F

  • Average High 2020–2025

    66.2 °F
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