La Mesa Weather Forecast

    • 64
    • 80

    Becoming Sunny

    • 65
    • 82

    Partly Sunny

    • 68
    • 84

    Mostly Sunny

    • 69
    • 86

    Mostly Sunny

    • 68
    • 87

    Partly Sunny

    • 66
    • 84

    Partly Sunny

Today 22 Sep San Diego County Inland Valleys

Mostly sunny. Warmer. Highs 80 to 85. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 22 Sep San Diego County Inland Valleys

Mostly clear in the evening. Becoming partly cloudy. Lows 56 to 62. Areas of Winds west 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

    76 °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

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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