St Jacob Weather Forecast

    • 71
    • 88

    Slight Chance Thunderstorms

    • 71
    • 89

    Mostly Sunny

    • 74
    • 92

    Partly Sunny

    • 75
    • 92

    Mostly Sunny

    • 74
    • 91

    Partly Sunny

    • 72
    • 87

    Chance Thunderstorms

Today 7 Aug Madison

Mostly sunny. A chance of Showers and Thunderstorms in the afternoon. Warmer with Highs in the upper 80s. Southwest Winds around 5 Mph. Chance of rain 30 percent. Heat index Values up to 100 in the afternoon.

Tonight 7 Aug Madison

Mostly cloudy with a chance of Showers and Thunderstorms. Near steady temperature in the upper 60s. South Winds around 5 Mph. Chance of rain 50 percent.

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St Jacob Temperature Statistics

August Temperature

Belleville, Scott AFB/MidAmerica Airport (11.8 miles)

  • Lowest 3 August, 2026

    64.8 °F

  • Average August

    74.8 °F

  • Highest 4 August, 2026

    87.8 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (11.8 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.9 °F

  • Average High 2021–2026

    68.1 °F
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