La Mesa Weather Forecast

    • 75
    • 94

    Mostly Sunny

    • 73
    • 94

    Mostly Sunny

    • 69
    • 91

    Mostly Sunny

    • 67
    • 86

    Mostly Sunny

    • 65
    • 82

    Mostly Sunny

    • 64
    • 81

    Mostly Sunny

Today 8 Sep San Diego County Inland Valleys

Mostly sunny in the Morning, then partly cloudy with a slight chance of Showers and Thunderstorms in the afternoon. Highs 94 to 99. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph in the afternoon. Chance of measurable precipitation 20 percent.

Tonight 8 Sep San Diego County Inland Valleys

Mostly clear. Lows 71 to 76. Areas of Winds northwest to 10 Mph in the evening becoming light.

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La Mesa Temperature Statistics

September Temperature

Gillespie Field Airport (5 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    69.6 °F

  • Highest 5 September, 2026

    95 °F

Climate (2021–2026)

Gillespie Field Airport (5 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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