Jerseyville Weather Forecast

    • 75
    • 90

    Chance Thunderstorms

    • 69
    • 91

    Chance Thunderstorms

    • 64
    • 84

    Partly Sunny

    • 70
    • 87

    Partly Sunny

    • 67
    • 91

    Mostly Cloudy

    • 64
    • 82

    Slight Chance Thunderstorms

Today 15 Aug Jersey

Mostly cloudy with Thunderstorms likely with a chance of Showers this Morning, then partly sunny this afternoon. Highs around 90. East Winds around 5 Mph, becoming southwest this afternoon. Chance of rain 70 percent. Heat index Values up to 106 this afternoon.

Tonight 15 Aug Jersey

Partly cloudy. A chance of Showers and Thunderstorms after midnight. Humid with Lows in the mid 70s. Southwest Winds around 5 Mph. Chance of rain 40 percent. Heat index Values up to 105 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

    78 °F

  • Highest 11 August, 2026

    95.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.9 °F
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