San Clemente Island - Mosquito Cove Weather Forecast

    • 66
    • 78

    Rain Showers Likely

    • 64
    • 80

    Chance Thunderstorms

    • 64
    • 80

    Partly Sunny

    • 64
    • 80

    Partly Sunny

    • 65
    • 81

    Patchy Fog

    • 65
    • 82

    Partly Sunny

Today 17 Sep Catalina and Santa Barbara Islands

Partly cloudy in the Morning, becoming mostly cloudy with a 30 percent chance of Showers in the afternoon. Highs from the lower to mid 70s near the coast to the lower to mid 80s interior. Areas of west Winds 15 to 25 Mph in the afternoon.

Tonight 17 Sep Catalina and Santa Barbara Islands

Mostly cloudy with a chance of Showers and a slight chance of Thunderstorms. Lows in the upper 50s and 60s. Areas of northwest Winds 15 to 25 Mph. Chance of precipitation 50 percent.

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San Clemente Island - Mosquito Cove Temperature Statistics

September Temperature

San Clemente Island NALF (14.9 miles)

  • Lowest 5 September, 2025

    62.1 °F

  • Average September

    67 °F

  • Highest 7 September, 2025

    75 °F

Climate (2020–Present)

San Clemente Island NALF (14.9 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    61.3 °F

  • Average High 2020–2025

    66.1 °F
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