El Cajon City Park Weather Forecast

    • 72
    • 99

    Hot

    • 68
    • 94

    Mostly Sunny

    • 64
    • 88

    Patchy Fog

    • 63
    • 86

    Mostly Sunny

    • 61
    • 85

    Mostly Sunny

    • 61
    • 84

    Mostly Sunny

Today 10 Sep San Diego County Inland Valleys

Mostly sunny. Highs 96 to 101. Areas of Winds south to 10 Mph becoming west this afternoon.

Tonight 10 Sep San Diego County Inland Valleys

Mostly clear. Lows 68 to 73. Areas of Winds southwest 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

    74.9 °F

  • Highest 7 September, 2026

    102.2 °F

Climate (2021–2026)

Gillespie Field Airport (1.9 miles)

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  • Average Low 2021–2026

    53.5 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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