El Cajon City Park Weather Forecast

    • 70
    • 94

    Increasing Clouds

    • 65
    • 89

    Mostly Cloudy

    • 66
    • 81

    Partly Sunny

    • 67
    • 86

    Mostly Sunny

    • 67
    • 88

    Mostly Sunny

    • 67
    • 89

    Partly Sunny

Today 26 Sep San Diego County Inland Valleys

Partly cloudy in the morning. Becoming mostly sunny. Highs 90 to 95. Light Winds becoming west 10 to 15 Mph in the afternoon.

Tonight 26 Sep San Diego County Inland Valleys

Mostly cloudy. Lows 64 to 68. Areas of Winds west to 10 Mph in the evening becoming light.

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El Cajon City Park Temperature Statistics

September Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    75.7 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

Gillespie Field Airport (1.9 miles)

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  • Average Low 2021–2026

    53.6 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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