National City Weather Forecast

    • 61
    • 87

    Becoming Sunny

    • 59
    • 81

    Mostly Sunny

    • 55
    • 78

    Partly Sunny

    • 53
    • 78

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

    • 60
    • 83

    Partly Sunny

Today 23 Aug St. Clair

Partly sunny this Morning, then becoming mostly cloudy. Highs in the mid 80s. West Winds 5 to 10 Mph.

Tonight 23 Aug St. Clair

Partly cloudy with a slight chance of Showers in the Evening, then clear after midnight. Lows in the upper 50s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

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National City Temperature Statistics

August Temperature

St. Louis Downtown Airport (5.6 miles)

  • Lowest 3 August, 2025

    56.6 °F

  • Average August

    80.3 °F

  • Highest 16 August, 2025

    98.7 °F

Climate (2020–Present)

St. Louis Downtown Airport (5.6 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    57.8 °F

  • Average High 2020–2025

    68.5 °F
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