El Cajon Weather Forecast

    • 47
    • 73

    Patchy Fog

    • 47
    • 76

    Patchy Fog

    • 49
    • 75

    Mostly Cloudy

    • 55
    • 72

    Rain Showers Likely

    • 54
    • 70

    Rain Showers

    • 51
    • 68

    Rain Showers Likely

Today 20 Dec San Diego County Inland Valleys

Patchy dense fog this morning. Partly cloudy. Local visibility one quarter mile or less at Times this morning. Highs 68 to 72 in the western Valleys to 70 to 75 near the Foothills. Light Winds.

Tonight 20 Dec San Diego County Inland Valleys

Partly cloudy. Patchy fog overnight. Lows 46 to 51 in wind Sheltered Areas to 48 to 56 in warmer Locations. Light Winds.

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El Cajon Temperature Statistics

December Temperature

Gillespie Field Airport (1.9 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 (1.9 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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