El Cajon City Park Weather Forecast

    • 68
    • 91

    Decreasing Clouds

    • 69
    • 92

    Mostly Sunny

    • 70
    • 92

    Mostly Sunny

    • 70
    • 93

    Mostly Sunny

    • 70
    • 93

    Mostly Sunny

    • 72
    • 95

    Mostly Sunny

Today 20 Aug San Diego County Inland Valleys

Patchy fog this morning. Partly cloudy. Highs 86 to 90 in the western Valleys to 92 to 97 near the Foothills. Areas of Winds southwest to 10 Mph.

Tonight 20 Aug San Diego County Inland Valleys

Mostly clear. Lows 65 to 70. Areas of Winds southwest to 10 Mph in the evening becoming light.

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El Cajon City Park Temperature Statistics

August Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 3 August, 2026

    66.2 °F

  • Average August

    73.8 °F

  • Highest 2 August, 2026

    93.2 °F

Climate (2021–2026)

Gillespie Field Airport (1.9 miles)

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  • Average Low 2021–2026

    53.5 °F

  • Average 2021–2026

    60.5 °F

  • Average High 2021–2026

    76.2 °F
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