El Cajon City Park Weather Forecast

    • 75
    • 101

    Hot

    • 74
    • 103

    Hot

    • 75
    • 102

    Hot

    • 70
    • 101

    Hot

    • 67
    • 91

    Mostly Sunny

    • 67
    • 88

    Mostly Sunny

Today 26 Aug San Diego County Inland Valleys

Mostly sunny. Highs 93 to 98 in the western Valleys to 98 to 103 near the Foothills. Areas of Winds west to 10 Mph becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 26 Aug San Diego County Inland Valleys

Partly cloudy. Patchy fog overnight. Lows 71 to 77. Areas of Winds west to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

El Cajon City Park Temperature Statistics

August Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 3 August, 2026

    66.2 °F

  • Average August

    74.5 °F

  • Highest 23 August, 2026

    100.4 °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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