Jerseyville Weather Forecast

    • 75
    • 94

    Becoming Sunny

    • 76
    • 94

    Partly Sunny

    • 74
    • 94

    Partly Sunny

    • 70
    • 90

    Thunderstorms Likely

    • 67
    • 83

    Thunderstorms Likely

    • 66
    • 82

    Chance Thunderstorms

Today 9 Aug Jersey

Mostly sunny. Highs in the lower 90s. South Winds 10 to 15 Mph. Heat index Values up to 106 this afternoon.

Tonight 9 Aug Jersey

Mostly clear. A chance of Showers and Thunderstorms after midnight. Lows in the mid 70s. South Winds 10 to 15 Mph. Chance of rain 30 percent. Heat index Values up to 103 early in the evening.

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Jerseyville Temperature Statistics

August Temperature

St. Charles, St. Charles County Smartt Airport (13.7 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    74.6 °F

  • Highest 4 August, 2026

    88.6 °F

Climate (2021–2026)

St. Charles, St. Charles County Smartt Airport (13.7 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    69 °F
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