Granite Hills Weather Forecast

    • 62
    • 83

    Mostly Sunny

    • 68
    • 88

    Slight Chance Rain Showers

    • 67
    • 88

    Slight Chance Rain Showers

    • 67
    • 90

    Partly Sunny

    • 67
    • 91

    Mostly Sunny

    • 67
    • 92

    Partly Sunny

    • 64
    • 89

    Mostly Sunny

Today 4 Sep San Diego County Inland Valleys

Mostly sunny. Highs 81 to 86. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph this afternoon.

Tonight 4 Sep San Diego County Inland Valleys

Mostly clear this evening. Becoming partly cloudy. Patchy fog overnight. Lows 59 to 63. Areas of Winds west to 10 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Granite Hills Temperature Statistics

September Temperature

Gillespie Field Airport (4.3 miles)

  • Lowest 1 September, 2026

    62.6 °F

  • Average September

    69.3 °F

  • Highest 1 September, 2026

    87.8 °F

Climate (2021–2026)

Gillespie Field Airport (4.3 miles)

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  • Average Low 2021–2026

    53.5 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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