Harbor Island Weather Forecast

    • 65
    • 72

    Increasing Clouds

    • 64
    • 74

    Partly Sunny

    • 67
    • 76

    Patchy Fog

    • 68
    • 79

    Patchy Fog

    • 69
    • 79

    Slight Chance Thunderstorms

    • 69
    • 79

    Slight Chance Thunderstorms

    • 68
    • 78

    Slight Chance Thunderstorms

Today 13 Sep San Diego County Coastal Areas

Mostly cloudy this morning. Becoming mostly sunny. Highs 70 to 75 near the coast to 74 to 77 inland. Light Winds becoming west 10 Mph this afternoon.

Tonight 13 Sep San Diego County Coastal Areas

Partly cloudy this evening. Becoming cloudy. Patchy fog overnight. Lows 59 to 64. Light Winds.

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  • Temperature Real-Time

Harbor Island Temperature Statistics

September Temperature

San Diego, San Diego International-Lindbergh Field (0.6 miles)

  • Lowest 5 September, 2025

    66.9 °F

  • Average September

    71.8 °F

  • Highest 7 September, 2025

    82 °F

Climate (2020–Present)

San Diego, San Diego International-Lindbergh Field (0.6 miles)

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  • Average Low 2020–2025

    57.9 °F

  • Average 2020–2025

    63.9 °F

  • Average High 2020–2025

    70.9 °F
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