Frontenac Weather Forecast

    • 77
    • 89

    Rain Showers

    • 77
    • 96

    Slight Chance Thunderstorms

    • 78
    • 98

    Hot

    • 77
    • 98

    Hot

    • 76
    • 95

    Chance Thunderstorms

    • 76
    • 95

    Chance Thunderstorms

Today 21 Jul St. Louis

Cloudy with Showers and Thunderstorms likely this Morning, then partly sunny with a chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall. Highs around 90. Southeast Winds around 5 Mph. Chance of rain 70 percent. Heat index Values up to 107 this afternoon.

Tonight 21 Jul St. Louis

Partly cloudy with a slight chance of Showers and Thunderstorms. Humid with Lows in the mid 70s. East Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 103 early in the evening.

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Frontenac Temperature Statistics

July Temperature

St. Louis Lambert International Airport (8.1 miles)

  • Lowest 2 July, 2025

    67.6 °F

  • Average July

    81.1 °F

  • Highest 16 July, 2025

    95.6 °F

Climate (2020–Present)

St. Louis Lambert International Airport (8.1 miles)

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  • Average Low 2020–2025

    50.4 °F

  • Average 2020–2025

    59.6 °F

  • Average High 2020–2025

    69 °F
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