San Clemente Island - Mosquito Cove Weather Forecast

    • 64
    • 78

    Partly Sunny

    • 70
    • 83

    Mostly Sunny

    • 68
    • 84

    Chance Rain Showers

    • 69
    • 84

    Partly Sunny

    • 70
    • 86

    Partly Sunny

    • 70
    • 87

    Partly Sunny

    • 67
    • 85

    Mostly Sunny

Today 4 Sep Catalina and Santa Barbara Islands

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

Tonight 4 Sep Catalina and Santa Barbara Islands

Partly cloudy. Lows in the lower to mid 60s.

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San Clemente Island - Mosquito Cove Temperature Statistics

September Temperature

San Clemente Island NALF (14.9 miles)

  • Lowest 1 September, 2026

    66.9 °F

  • Average September

    71.7 °F

  • Highest 2 September, 2026

    75 °F

Climate (2021–2026)

San Clemente Island NALF (14.9 miles)

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  • Average Low 2021–2026

    57.8 °F

  • Average 2021–2026

    62.3 °F

  • Average High 2021–2026

    66.7 °F
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