San Clemente Island - Northwest Harbor Weather Forecast

    • 63
    • 72

    Increasing Clouds

    • 63
    • 71

    Mostly Cloudy

    • 63
    • 71

    Mostly Cloudy

    • 64
    • 72

    Partly Sunny

    • 64
    • 72

    Mostly Cloudy

    • 64
    • 72

    Partly Sunny

Today 14 Aug Catalina and Santa Barbara Islands

Cloudy in the morning then partly cloudy. Highs from around 70 near the coast to around 80 interior.

Tonight 14 Aug Catalina and Santa Barbara Islands

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

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

San Clemente Island - Northwest Harbor Temperature Statistics

August Temperature

San Clemente Island NALF (0.6 miles)

  • Lowest 3 August, 2026

    66 °F

  • Average August

    74 °F

  • Highest 10 August, 2026

    79 °F

Climate (2021–2026)

San Clemente Island NALF (0.6 miles)

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

  • Average Low 2021–2026

    57.8 °F

  • Average 2021–2026

    62.3 °F

  • Average High 2021–2026

    66.7 °F
Get WillyWeather+ to remove ads