Jamul Weather Forecast

    • 61
    • 83

    Mostly Sunny

    • 65
    • 83

    Mostly Sunny

    • 66
    • 85

    Mostly Sunny

    • 67
    • 87

    Mostly Sunny

    • 65
    • 88

    Mostly Sunny

Today 22 Sep San Diego County Inland Valleys

Partly cloudy in the morning. Becoming sunny. Highs 82 to 87. Light Winds becoming west 10 Mph in the afternoon.

Tonight 22 Sep San Diego County Inland Valleys

Mostly clear. Lows 59 to 63. Areas of Winds northwest to 10 Mph in the 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 °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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