El Cajon City Park Weather Forecast

    • 66
    • 88

    Becoming Sunny

    • 68
    • 89

    Mostly Sunny

    • 69
    • 92

    Partly Sunny

    • 68
    • 93

    Mostly Cloudy

    • 66
    • 87

    Partly Sunny

    • 64
    • 83

    Mostly Sunny

Today 23 Sep San Diego County Inland Valleys

Mostly sunny. Warmer. Highs 85 to 89 in the western Valleys to 89 to 94 near the Foothills. Light Winds becoming west 10 to 15 Mph this afternoon.

Tonight 23 Sep San Diego County Inland Valleys

Mostly clear. Patchy fog overnight. Lows 62 to 66. 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

    75.9 °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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