El Cajon City Park Weather Forecast

    • 50
    • 80

    Mostly Sunny

    • 52
    • 78

    Patchy Fog

    • 50
    • 78

    Mostly Sunny

    • 52
    • 82

    Mostly Sunny

    • 52
    • 81

    Partly Sunny

    • 50
    • 77

    Partly Sunny

Today 12 Dec San Diego County Inland Valleys

Mostly sunny this morning. Becoming partly cloudy. Patchy fog this morning. Local visibility one quarter mile or less at Times this morning. Highs 75 to 79 in the western Valleys to 78 to 83 near the Foothills. Light Winds becoming west 10 Mph this afternoon.

Tonight 12 Dec San Diego County Inland Valleys

Partly cloudy in the evening. Becoming mostly clear. Lows 46 to 53 in wind Sheltered Areas to 50 to 58 in warmer Locations. Light Winds.

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El Cajon City Park Temperature Statistics

December Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 5 December, 2025

    39.2 °F

  • Average December

    53.4 °F

  • Highest 9 December, 2025

    84.2 °F

Climate (2020–Present)

Gillespie Field Airport (1.9 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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