Jamul Weather Forecast

    • 58
    • 80

    Mostly Sunny

    • 58
    • 78

    Decreasing Clouds

    • 57
    • 79

    Mostly Sunny

    • 58
    • 81

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

    • 58
    • 80

    Partly Sunny

    • 58
    • 79

    Mostly Sunny

Today 15 Sep San Diego County Inland Valleys

Partly cloudy in the morning. Becoming mostly sunny. Highs 79 to 83 in the western Valleys to 82 to 87 near the Foothills.

Tonight 15 Sep San Diego County Inland Valleys

Partly cloudy this evening. Becoming mostly cloudy. Lows 54 to 60. Areas of Winds southwest 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

    76.6 °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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