El Cajon City Park Weather Forecast

    • 47
    • 73

    Patchy Fog

    • 47
    • 76

    Patchy Fog

    • 49
    • 75

    Mostly Cloudy

    • 53
    • 72

    Rain Showers Likely

    • 54
    • 69

    Rain Showers

    • 51
    • 69

    Rain Showers Likely

Today 20 Dec San Diego County Inland Valleys

Patchy fog in the morning. Partly cloudy. Highs 69 to 73 in the western Valleys to 71 to 76 near the Foothills. Light Winds becoming southwest to 10 Mph in the afternoon.

Tonight 20 Dec San Diego County Inland Valleys

Partly cloudy. Patchy fog overnight. Lows 44 to 52 in wind Sheltered Areas to 49 to 55 in warmer Locations. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

El Cajon City Park 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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