La Mesa Weather Forecast

    • 69
    • 81

    Chance Rain Showers

    • 68
    • 86

    Mostly Sunny

    • 66
    • 84

    Mostly Sunny

    • 67
    • 86

    Mostly Sunny

    • 68
    • 87

    Mostly Sunny

    • 68
    • 88

    Mostly Sunny

    • 67
    • 87

    Partly Sunny

Today 28 Aug San Diego County Inland Valleys

Cloudy with a chance of Showers. A slight chance of Thunderstorms this afternoon. Highs 81 to 84 in the western Valleys to 76 to 81 near the Foothills. Areas of Winds north 10 to 15 Mph. Chance of measurable precipitation 50 percent.

Tonight 28 Aug San Diego County Inland Valleys

Partly cloudy with a slight chance of Showers this Evening, then mostly clear overnight. Lows 64 to 68. Light Winds. Chance of measurable precipitation 20 percent.

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La Mesa Temperature Statistics

August Temperature

Gillespie Field Airport (5 miles)

  • Lowest 19 August, 2025

    59 °F

  • Average August

    70.1 °F

  • Highest 7 August, 2025

    98.6 °F

Climate (2020–Present)

Gillespie Field Airport (5 miles)

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  • Average Low 2020–2025

    52.9 °F

  • Average 2020–2025

    60.2 °F

  • Average High 2020–2025

    76 °F
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