Scott Air Force Base/Midamerica Airport Weather Forecast

    • 63
    • 88

    Chance Thunderstorms

    • 65
    • 87

    Chance Rain Showers

    • 65
    • 86

    Rain Showers Likely

    • 64
    • 86

    Chance Thunderstorms

    • 63
    • 81

    Chance Thunderstorms

    • 60
    • 79

    Chance Rain Showers

Today 19 Sep St. Clair

Mostly cloudy in the Morning, then becoming partly sunny. A slight chance of Showers. A slight chance of Thunderstorms in the afternoon. Highs in the mid 80s. West Winds around 5 Mph. Chance of rain 20 percent.

Tonight 19 Sep St. Clair

Mostly cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the upper 60s. North Winds around 5 Mph. Chance of rain 20 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

    71.7 °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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