Jamul Weather Forecast

    • 71
    • 88

    Decreasing Clouds

    • 70
    • 91

    Partly Sunny

    • 71
    • 92

    Mostly Sunny

    • 70
    • 93

    Slight Chance Rain Showers

    • 69
    • 91

    Mostly Sunny

    • 65
    • 87

    Mostly Sunny

    • 63
    • 83

    Sunny

Today 6 Sep San Diego County Inland Valleys

Cloudy with a slight chance of Showers this Morning, then partly cloudy with a chance of Showers this afternoon. Highs 85 to 90. Areas of Winds north to 10 Mph. Chance of measurable precipitation 50 percent.

Tonight 6 Sep San Diego County Inland Valleys

Partly cloudy. Lows 68 to 74. Areas of Winds northwest 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

    68.4 °F

  • Highest 1 September, 2026

    87.8 °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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