Grantville Weather Forecast

    • 64
    • 80

    Mostly Sunny

    • 66
    • 81

    Increasing Clouds

    • 67
    • 84

    Patchy Fog

    • 69
    • 87

    Mostly Sunny

    • 73
    • 92

    Mostly Sunny

    • 74
    • 94

    Mostly Sunny

    • 75
    • 96

    Mostly Sunny

Today 28 Sep San Diego County Coastal Areas

Mostly sunny. Highs 86 to 91 near the coast to 95 to 98 inland.

Tonight 28 Sep San Diego County Coastal Areas

Mostly clear this evening. Becoming partly cloudy. Patchy fog overnight. Cooler. Lows 58 to 64. Areas of Winds west to 10 Mph this evening becoming light.

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Grantville Temperature Statistics

September Temperature

San Diego, Montgomery Field (2.5 miles)

  • Lowest 3 September, 2026

    59.6 °F

  • Average September

    76.4 °F

  • Highest 9 September, 2026

    103.6 °F

Climate (2021–2026)

San Diego, Montgomery Field (2.5 miles)

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  • Average Low 2021–2026

    56.3 °F

  • Average 2021–2026

    64.6 °F

  • Average High 2021–2026

    73.6 °F
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