La Mesa Weather Forecast

    • 65
    • 83

    Increasing Clouds

    • 63
    • 81

    Increasing Clouds

    • 61
    • 79

    Partly Sunny

    • 62
    • 79

    Mostly Sunny

    • 62
    • 81

    Mostly Sunny

    • 63
    • 82

    Mostly Sunny

    • 63
    • 83

    Mostly Sunny

Today 13 Sep San Diego County Inland Valleys

Partly cloudy with patchy fog this morning. Becoming sunny. Highs 83 to 87 in the western Valleys to 85 to 90 near the Foothills. Light Winds becoming west 10 Mph this afternoon.

Tonight 13 Sep San Diego County Inland Valleys

Mostly clear this evening. Becoming partly cloudy. Lows 58 to 63. Areas of Winds southwest to 10 Mph this evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

La Mesa Temperature Statistics

September Temperature

Gillespie Field Airport (5 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    76.8 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

Gillespie Field Airport (5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    53.6 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
Get WillyWeather+ to remove ads