National City Weather Forecast

    • 69
    • 81

    Chance Thunderstorms

    • 68
    • 79

    Increasing Clouds

    • 68
    • 78

    Mostly Cloudy

    • 67
    • 76

    Chance Rain Showers

    • 68
    • 78

    Patchy Fog

    • 67
    • 78

    Partly Sunny

    • 66
    • 78

    Partly Sunny

Today 18 Sep San Diego County Coastal Areas

Partly cloudy with a chance of Showers. A slight chance of Thunderstorms this Morning, then a chance of Thunderstorms this afternoon. Highs 76 to 81 near the coast to 82 to 85 inland. Areas of Winds west to 10 Mph. Chance of measurable precipitation 50 percent.

Tonight 18 Sep San Diego County Coastal Areas

Partly cloudy. Lows 65 to 69. Areas of Winds west to 10 Mph this evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

National City Temperature Statistics

September Temperature

San Diego, San Diego International-Lindbergh Field (6.2 miles)

  • Lowest 13 September, 2025

    66 °F

  • Average September

    71.6 °F

  • Highest 7 September, 2025

    82 °F

Climate (2020–Present)

San Diego, San Diego International-Lindbergh Field (6.2 miles)

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

  • Average Low 2020–2025

    57.9 °F

  • Average 2020–2025

    63.9 °F

  • Average High 2020–2025

    70.8 °F
Get WillyWeather+ to remove ads