Granite Hills Weather Forecast

    • 56
    • 85

    Mostly Sunny

    • 55
    • 83

    Mostly Sunny

    • 55
    • 84

    Mostly Sunny

    • 54
    • 78

    Partly Sunny

    • 51
    • 70

    Partly Sunny

    • 54
    • 76

    Partly Sunny

    • 55
    • 80

    Mostly Sunny

Today 18 Oct San Diego County Inland Valleys

Mostly sunny. Highs 81 to 86. Areas of Winds east to 10 Mph becoming west 10 Mph this afternoon.

Tonight 18 Oct San Diego County Inland Valleys

Partly cloudy. Lows 53 to 58. Light Winds.

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Granite Hills Temperature Statistics

October Temperature

Gillespie Field Airport (4.3 miles)

  • Lowest 16 October, 2025

    48.2 °F

  • Average October

    63.6 °F

  • Highest 10 October, 2025

    84.2 °F

Climate (2020–Present)

Gillespie Field Airport (4.3 miles)

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  • Average Low 2020–2025

    52.9 °F

  • Average 2020–2025

    60.1 °F

  • Average High 2020–2025

    75.8 °F
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