Jamul Weather Forecast

    • 64
    • 88

    Mostly Sunny

    • 61
    • 85

    Mostly Sunny

    • 59
    • 83

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

    • 59
    • 82

    Sunny

Today 12 Sep San Diego County Inland Valleys

Patchy fog this morning. Mostly sunny. Highs 86 to 90 in the western Valleys to 89 to 94 near the Foothills. Areas of Winds west to 10 Mph.

Tonight 12 Sep San Diego County Inland Valleys

Partly cloudy. Patchy fog overnight. Lows 61 to 66. 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

    76.8 °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

    53.5 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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