Jerseyville Weather Forecast

    • 68
    • 89

    Chance Thunderstorms

    • 63
    • 84

    Partly Sunny

    • 69
    • 87

    Partly Sunny

    • 63
    • 86

    Mostly Cloudy

    • 61
    • 80

    Slight Chance Thunderstorms

    • 62
    • 82

    Partly Sunny

Today 16 Aug Jersey

Mostly cloudy with a chance of Showers and Thunderstorms this Morning, then partly sunny with a slight chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. West Winds 5 to 10 Mph. Gusts up to 20 Mph this morning. Chance of rain 50 percent. Heat index Values up to 102.

Tonight 16 Aug Jersey

Partly cloudy. A chance of Showers and Thunderstorms, mainly in the evening. Humid with Lows in the upper 60s. North Winds 5 to 10 Mph. Chance of rain 30 percent.

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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

    78.5 °F

  • Highest 13 August, 2026

    96.1 °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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