San Clemente Island - Mosquito Cove Weather Forecast

    • 62
    • 73

    Mostly Sunny

    • 61
    • 77

    Partly Sunny

    • 62
    • 72

    Patchy Fog

    • 61
    • 73

    Mostly Cloudy

    • 63
    • 74

    Partly Sunny

    • 65
    • 77

    Partly Sunny

    • 66
    • 80

    Partly Sunny

Today 18 Sep Catalina and Santa Barbara Islands

Partly cloudy. Highs in the upper 70s to mid 80s.

Tonight 18 Sep Catalina and Santa Barbara Islands

Mostly clear in the evening then partly cloudy. Lows in the mid 50s 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

    75.4 °F

  • Highest 9 September, 2026

    87.1 °F

Climate (2021–2026)

San Clemente Island NALF (14.9 miles)

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  • Average Low 2021–2026

    57.9 °F

  • Average 2021–2026

    62.4 °F

  • Average High 2021–2026

    66.8 °F
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