Lebanon Weather Forecast

    • 62
    • 87

    Mostly Sunny

    • 72
    • 94

    Partly Sunny

    • 70
    • 97

    Rain Showers

    • 62
    • 84

    Partly Sunny

    • 66
    • 87

    Chance Rain Showers

    • 68
    • 91

    Slight Chance Thunderstorms

Today 7 Sep St. Clair

Partly sunny this Morning, then clearing. Highs in the upper 80s. East Winds 5 to 10 Mph.

Tonight 7 Sep St. Clair

Mostly clear. Lows in the lower 60s. East Winds 5 to 10 Mph.

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Lebanon Temperature Statistics

September Temperature

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

  • Lowest 1 September, 2026

    71.6 °F

  • Average September

    86.7 °F

  • Highest 5 September, 2026

    101.8 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

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  • Average Low 2021–2026

    48 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.2 °F
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