Scott Air Force Base/Midamerica Airport Weather Forecast

    • 63
    • 88

    Chance Thunderstorms

    • 65
    • 87

    Chance Rain Showers

    • 65
    • 86

    Rain Showers Likely

    • 65
    • 82

    Chance Thunderstorms

    • 65
    • 82

    Chance Thunderstorms

    • 62
    • 79

    Chance Rain Showers

Today 19 Sep St. Clair

Partly sunny. A slight chance of Showers and Thunderstorms this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. West Winds around 5 Mph. Chance of rain 40 percent.

Tonight 19 Sep St. Clair

Partly cloudy with a chance of Showers. A chance of Thunderstorms, mainly in the evening. Lows in the mid 60s. Northwest Winds around 5 Mph. Chance of rain 30 percent.

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Scott Air Force Base/Midamerica Airport Temperature Statistics

September Temperature

Belleville, Scott AFB/MidAmerica Airport (0.6 miles)

  • Lowest 8 September, 2025

    44.6 °F

  • Average September

    72 °F

  • Highest 14 September, 2025

    98.6 °F

Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (0.6 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    57.2 °F

  • Average High 2020–2025

    67.4 °F
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