El Cajon City Park Weather Forecast

    • 47
    • 65

    Slight Chance Rain Showers

    • 47
    • 66

    Mostly Cloudy

    • 47
    • 65

    Mostly Cloudy

    • 42
    • 66

    Partly Sunny

    • 43
    • 67

    Mostly Sunny

    • 45
    • 71

    Mostly Sunny

    • 46
    • 74

    Mostly Sunny

Today 5 Jan San Diego County Inland Valleys

Mostly cloudy with scattered Showers this Morning, then partly cloudy with a slight chance of Showers this afternoon. Highs 62 to 65 in the western Valleys to 55 to 60 near the Foothills. Areas of Winds south 10 Mph. Chance of measurable precipitation 30 percent.

Tonight 5 Jan San Diego County Inland Valleys

Mostly cloudy. Lows 42 to 49 in wind Sheltered Areas to 46 to 51 in warmer Locations. Light Winds.

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El Cajon City Park Temperature Statistics

January Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 1 January, 2026

    59 °F

  • Average January

    61.3 °F

  • Highest 2 January, 2026

    71.6 °F

Climate (2021–Present)

Gillespie Field Airport (1.9 miles)

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  • Average Low 2021–2026

    53.2 °F

  • Average 2021–2026

    60.2 °F

  • Average High 2021–2026

    75.8 °F
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