El Cajon Mountain Weather Forecast

    • 63
    • 84

    Increasing Clouds

    • 65
    • 86

    Partly Sunny

    • 60
    • 79

    Chance Rain Showers

    • 54
    • 74

    Slight Chance Rain Showers

    • 60
    • 79

    Mostly Sunny

    • 61
    • 83

    Mostly Sunny

Today 25 Sep San Diego County Inland Valleys

Mostly sunny. Highs 87 to 92. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 25 Sep San Diego County Inland Valleys

Partly cloudy. Patchy fog overnight. Lows 62 to 67. Areas of Winds west to 10 Mph in the evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

El Cajon Mountain Temperature Statistics

September Temperature

Ramona, Ramona Airport (9.9 miles)

  • Lowest 3 September, 2026

    50 °F

  • Average September

    72.9 °F

  • Highest 9 September, 2026

    104 °F

Climate (2021–2026)

Ramona, Ramona Airport (9.9 miles)

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

  • Average Low 2021–2026

    51.7 °F

  • Average 2021–2026

    64.7 °F

  • Average High 2021–2026

    76.9 °F
Get WillyWeather+ to remove ads