El Cajon Weather Forecast

    • 68
    • 94

    Mostly Sunny

    • 68
    • 89

    Rain Showers Likely

    • 67
    • 85

    Rain Showers Likely

    • 65
    • 84

    Slight Chance Thunderstorms

    • 67
    • 86

    Patchy Fog

    • 68
    • 89

    Patchy Fog

    • 68
    • 90

    Partly Sunny

Today 16 Sep San Diego County Inland Valleys

Mostly sunny. Highs 91 to 96. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 16 Sep San Diego County Inland Valleys

Partly cloudy this evening. Becoming mostly cloudy. Lows 65 to 69. Areas of Winds west to 10 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

El Cajon 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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