Santa Catalina Island - Avalon Bay Weather Forecast

    • 68
    • 75

    Chance Rain Showers

    • 67
    • 73

    Partly Sunny

    • 66
    • 72

    Partly Sunny

    • 67
    • 73

    Mostly Cloudy

    • 68
    • 75

    Patchy Fog

    • 67
    • 75

    Patchy Fog

Today 18 Sep Catalina and Santa Barbara Islands

Showers likely and a slight chance of Thunderstorms in the Morning, becoming partly cloudy with a chance of Showers and a slight chance of Thunderstorms in the afternoon. Highs from the lower to mid 70s near the coast to the lower 80s interior. Chance of precipitation 70 percent.

Tonight 18 Sep Catalina and Santa Barbara Islands

Mostly cloudy with a 20 percent chance of Showers and Thunderstorms. Lows in the 60s to around 70.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Santa Catalina Island - Avalon Bay Temperature Statistics

September Temperature

San Clemente Island NALF (26.7 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 (26.7 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    61.3 °F

  • Average High 2020–2025

    66.1 °F
Get WillyWeather+ to remove ads