San Clemente Island - Northwest Harbor Weather Forecast

    • 63
    • 70

    Mostly Cloudy

    • 65
    • 69

    Mostly Cloudy

    • 64
    • 70

    Partly Sunny

    • 65
    • 72

    Partly Sunny

    • 64
    • 69

    Partly Sunny

    • 64
    • 69

    Mostly Cloudy

    • 64
    • 69

    Partly Sunny

Today 19 Jul Catalina and Santa Barbara Islands

Low Clouds and fog in the morning then mostly cloudy. Highs from the lower to mid 70s near the coast to the lower to mid 80s interior.

Tonight 19 Jul Catalina and Santa Barbara Islands

Mostly cloudy. Lows in the upper 50s to mid 60s.

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San Clemente Island - Northwest Harbor Temperature Statistics

July Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 1 July, 2026

    64 °F

  • Average July

    72.9 °F

  • Highest 16 July, 2026

    82.9 °F

Climate (2021–2026)

San Clemente Island NALF (0.6 miles)

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  • Average Low 2021–2026

    57.7 °F

  • Average 2021–2026

    62.2 °F

  • Average High 2021–2026

    66.6 °F
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