La Mesa Weather Forecast

    • 67
    • 85

    Mostly Cloudy

    • 62
    • 81

    Partly Sunny

    • 65
    • 81

    Mostly Sunny

    • 67
    • 84

    Mostly Sunny

    • 69
    • 88

    Mostly Sunny

    • 73
    • 90

    Mostly Sunny

    • 73
    • 95

    Mostly Sunny

Today 27 Sep San Diego County Inland Valleys

Mostly sunny. Highs 93 to 98.

Tonight 27 Sep San Diego County Inland Valleys

Cloudy with a slight chance of Showers. Cooler. Lows 61 to 66. Light Winds. Chance of measurable precipitation 20 percent.

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La Mesa Temperature Statistics

September Temperature

Gillespie Field Airport (5 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    75.7 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

Gillespie Field Airport (5 miles)

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  • Average Low 2021–2026

    53.6 °F

  • Average 2021–2026

    60.7 °F

  • Average High 2021–2026

    76.3 °F
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