La Mesa Weather Forecast

    • 53
    • 66

    Mostly Cloudy

    • 58
    • 66

    Rain Showers

    • 57
    • 65

    Rain Showers

    • 53
    • 66

    Rain Showers

    • 48
    • 63

    Rain Showers Likely

    • 46
    • 64

    Chance Rain Showers

Today 22 Dec San Diego County Inland Valleys

Partly cloudy. Highs around 68 in the western Valleys to 71 to 76 near the Foothills. Light Winds.

Tonight 22 Dec San Diego County Inland Valleys

Mostly cloudy. Patchy fog overnight. Lows 45 to 52 in wind Sheltered Areas to 50 to 55 in warmer Locations. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

La Mesa Temperature Statistics

December Temperature

Gillespie Field Airport (5 miles)

  • Lowest 5 December, 2025

    39.2 °F

  • Average December

    53.9 °F

  • Highest 10 December, 2025

    86 °F

Climate (2020–Present)

Gillespie Field Airport (5 miles)

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  • Average Low 2020–2025

    53.1 °F

  • Average 2020–2025

    60.2 °F

  • Average High 2020–2025

    75.8 °F
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