Jamul Weather Forecast

    • 43
    • 68

    Becoming Sunny

    • 46
    • 67

    Mostly Sunny

    • 47
    • 69

    Sunny

    • 50
    • 72

    Sunny

    • 53
    • 76

    Sunny

    • 53
    • 79

    Sunny

Today 4 Dec San Diego County Inland Valleys

Mostly sunny. Highs 70 to 73 in the western Valleys to 63 to 68 near the Foothills. Areas of Winds east 10 to 15 Mph with Gusts to 30 Mph.

Tonight 4 Dec San Diego County Inland Valleys

Mostly clear. Lows 37 to 42. Areas of Winds east 10 Mph.

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Jamul Temperature Statistics

December Temperature

Gillespie Field Airport (9.3 miles)

  • Lowest 1 December, 2025

    48.2 °F

  • Average December

    55.6 °F

  • Highest 1 December, 2025

    68 °F

Climate (2020–Present)

Gillespie Field Airport (9.3 miles)

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  • Average Low 2020–2025

    53 °F

  • Average 2020–2025

    60.1 °F

  • Average High 2020–2025

    75.8 °F
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