La Mesa Weather Forecast

    • 69
    • 91

    Becoming Sunny

    • 70
    • 94

    Patchy Fog

    • 75
    • 95

    Mostly Sunny

    • 73
    • 95

    Mostly Sunny

    • 69
    • 93

    Mostly Sunny

    • 67
    • 87

    Partly Sunny

Today 25 Aug San Diego County Inland Valleys

Mostly sunny. Highs 90 to 95 in the western Valleys to 96 to 101 near the Foothills. Areas of Winds west to 10 Mph becoming 10 to 15 Mph in the afternoon.

Tonight 25 Aug San Diego County Inland Valleys

Mostly clear. Lows 66 to 74. Areas of Winds west to 10 Mph in the evening becoming light.

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La Mesa Temperature Statistics

August Temperature

Gillespie Field Airport (5 miles)

  • Lowest 3 August, 2026

    66.2 °F

  • Average August

    74.2 °F

  • Highest 22 August, 2026

    96.8 °F

Climate (2021–2026)

Gillespie Field Airport (5 miles)

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  • Average Low 2021–2026

    53.5 °F

  • Average 2021–2026

    60.5 °F

  • Average High 2021–2026

    76.3 °F
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