El Cajon City Park Weather Forecast

    • 70
    • 84

    Rain Showers Likely

    • 68
    • 87

    Rain Showers Likely

    • 65
    • 86

    Slight Chance Thunderstorms

    • 67
    • 86

    Patchy Fog

    • 68
    • 89

    Patchy Fog

    • 68
    • 90

    Partly Sunny

Today 17 Sep San Diego County Inland Valleys

Partly cloudy. A slight chance of Showers and Thunderstorms in the afternoon. Highs 85 to 90. Light Winds becoming southwest 10 Mph in the afternoon. Chance of measurable precipitation 20 percent.

Tonight 17 Sep San Diego County Inland Valleys

Mostly cloudy with a chance of Showers and a slight chance of Thunderstorms. Lows 65 to 68. Light Winds. Chance of measurable precipitation 50 percent.

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El Cajon City Park Temperature Statistics

September Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 6 September, 2025

    62.6 °F

  • Average September

    71.6 °F

  • Highest 7 September, 2025

    95 °F

Climate (2020–Present)

Gillespie Field Airport (1.9 miles)

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  • Average Low 2020–2025

    52.9 °F

  • Average 2020–2025

    60.2 °F

  • Average High 2020–2025

    76 °F
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