St Jacob Weather Forecast

    • 61
    • 76

    Mostly Cloudy

    • 55
    • 74

    Mostly Cloudy

    • 55
    • 75

    Partly Sunny

    • 56
    • 76

    Partly Sunny

    • 55
    • 77

    Partly Sunny

    • 56
    • 76

    Mostly Cloudy

Today 21 Sep Madison

Cloudy. Patchy fog this morning. A slight chance of Showers this afternoon. Much cooler with Highs in the mid 70s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 21 Sep Madison

Mostly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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St Jacob Temperature Statistics

September Temperature

Belleville, Scott AFB/MidAmerica Airport (11.8 miles)

  • Lowest 8 September, 2026

    60.1 °F

  • Average September

    81.2 °F

  • Highest 5 September, 2026

    101.8 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (11.8 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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