Jamul Weather Forecast

    • 55
    • 81

    Mostly Sunny

    • 51
    • 77

    Mostly Sunny

    • 52
    • 72

    Partly Sunny

    • 52
    • 73

    Partly Sunny

    • 51
    • 71

    Mostly Cloudy

    • 54
    • 69

    Rain Likely

Today 18 Dec San Diego County Inland Valleys

Mostly sunny. Warmer. Highs 81 to 86. Areas of Winds northeast to 10 Mph becoming west 10 Mph this afternoon.

Tonight 18 Dec San Diego County Inland Valleys

Mostly clear. Lows 47 to 55 in wind Sheltered Areas to 52 to 59 in warmer Locations. Light Winds.

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Jamul Temperature Statistics

December Temperature

Gillespie Field Airport (9.3 miles)

  • Lowest 5 December, 2025

    39.2 °F

  • Average December

    53.8 °F

  • Highest 10 December, 2025

    86 °F

Climate (2020–Present)

Gillespie Field Airport (9.3 miles)

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  • Average Low 2020–2025

    53.1 °F

  • Average 2020–2025

    60.2 °F

  • Average High 2020–2025

    75.8 °F
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