Jamul Weather Forecast

    • 66
    • 83

    Chance Rain Showers

    • 64
    • 84

    Chance Rain Showers

    • 63
    • 81

    Slight Chance Thunderstorms

    • 64
    • 83

    Mostly Sunny

    • 65
    • 85

    Partly Sunny

    • 67
    • 86

    Mostly Sunny

    • 65
    • 86

    Mostly Sunny

Today 17 Sep San Diego County Inland Valleys

Mostly cloudy. A slight chance of Showers and Thunderstorms this afternoon. Highs 81 to 86. Areas of Winds west to 10 Mph. Chance of measurable precipitation 20 percent.

Tonight 17 Sep San Diego County Inland Valleys

Mostly cloudy with a chance of Showers and a slight chance of Thunderstorms. Lows 64 to 68. Areas of Winds northwest to 10 Mph this evening becoming light. Chance of measurable precipitation 50 percent.

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Jamul Temperature Statistics

September Temperature

Gillespie Field Airport (9.3 miles)

  • Lowest 6 September, 2025

    62.6 °F

  • Average September

    71.7 °F

  • Highest 7 September, 2025

    95 °F

Climate (2020–Present)

Gillespie Field Airport (9.3 miles)

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  • Average Low 2020–2025

    52.9 °F

  • Average 2020–2025

    60.2 °F

  • Average High 2020–2025

    75.9 °F
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