El Cajon City Park Weather Forecast

    • 63
    • 81

    Increasing Clouds

    • 61
    • 81

    Partly Sunny

    • 61
    • 82

    Mostly Sunny

    • 62
    • 84

    Mostly Sunny

    • 62
    • 83

    Partly Sunny

    • 62
    • 82

    Partly Sunny

    • 62
    • 83

    Mostly Sunny

Today 16 Sep San Diego County Inland Valleys

Partly cloudy in the morning. Becoming mostly sunny. Highs 82 to 85 in the western Valleys to 85 to 90 near the Foothills.

Tonight 16 Sep San Diego County Inland Valleys

Partly cloudy this evening. Becoming mostly cloudy. Patchy fog overnight. Lows 54 to 61. Areas of Winds southwest to 10 Mph this evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

El Cajon City Park Temperature Statistics

September Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    76.5 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

Gillespie Field Airport (1.9 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    53.6 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
Get WillyWeather+ to remove ads