El Cajon Weather Forecast

    • 61
    • 89

    Mostly Sunny

    • 59
    • 86

    Partly Sunny

    • 59
    • 81

    Partly Sunny

    • 60
    • 79

    Rain Showers Likely

    • 58
    • 72

    Rain Showers Likely

    • 55
    • 72

    Mostly Sunny

Today 18 Oct San Diego County Inland Valleys

Mostly sunny. Highs 86 to 89 in the western Valleys to 78 to 83 near the Foothills. Areas of Winds east to 10 Mph becoming west 10 Mph in the afternoon.

Tonight 18 Oct San Diego County Inland Valleys

Mostly clear. Lows 56 to 61. Light Winds.

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El Cajon Temperature Statistics

October Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 14 October, 2026

    50 °F

  • Average October

    72.5 °F

  • Highest 3 October, 2026

    105.8 °F

Climate (2021–2026)

Gillespie Field Airport (1.9 miles)

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  • Average Low 2021–2026

    53.7 °F

  • Average 2021–2026

    60.7 °F

  • Average High 2021–2026

    76.5 °F
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