Harbor Island Weather Forecast

    • 55
    • 76

    Mostly Sunny

    • 54
    • 72

    Mostly Sunny

    • 54
    • 69

    Mostly Cloudy

    • 54
    • 68

    Mostly Cloudy

    • 53
    • 67

    Partly Sunny

    • 52
    • 68

    Partly Sunny

Today 10 Dec San Diego County Coastal Areas

Mostly sunny. Highs 72 to 77 near the coast to 79 to 83 inland. Light Winds becoming west to 10 Mph in the afternoon.

Tonight 10 Dec San Diego County Coastal Areas

Mostly clear. Lows 46 to 53. Light Winds.

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Harbor Island Temperature Statistics

December Temperature

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

  • Lowest 5 December, 2025

    46 °F

  • Average December

    58.6 °F

  • Highest 4 December, 2025

    72 °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

    63.8 °F

  • Average High 2020–2025

    70.6 °F
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