Jamul Weather Forecast

    • 58
    • 77

    Becoming Sunny

    • 59
    • 79

    Mostly Sunny

    • 60
    • 77

    Partly Sunny

    • 58
    • 76

    Partly Sunny

    • 59
    • 78

    Mostly Sunny

    • 63
    • 84

    Mostly Sunny

    • 65
    • 85

    Mostly Sunny

Today 18 Sep San Diego County Inland Valleys

Partly cloudy in the morning. Becoming mostly sunny. Highs 86 to 89 in the western Valleys to 87 to 92 near the Foothills.

Tonight 18 Sep San Diego County Inland Valleys

Mostly clear this evening. Becoming partly cloudy. Lows 54 to 60. Areas of Winds west to 10 Mph this evening becoming light.

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Jamul Temperature Statistics

September Temperature

Gillespie Field Airport (9.3 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    76.2 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

Gillespie Field Airport (9.3 miles)

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  • Average Low 2021–2026

    53.6 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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