Jerseyville Weather Forecast

    • 76
    • 95

    Isolated Thunderstorms

    • 76
    • 96

    Mostly Sunny

    • 69
    • 91

    Partly Sunny

    • 66
    • 87

    Mostly Sunny

    • 67
    • 87

    Slight Chance Thunderstorms

    • 68
    • 87

    Slight Chance Thunderstorms

Today 26 Jul Jersey

Partly sunny. A chance of Showers and Thunderstorms, mainly in the morning. Humid with Highs in the lower 90s. Southwest Winds around 5 Mph. Chance of rain 40 percent. Heat index Values up to 107.

Tonight 26 Jul Jersey

Mostly cloudy. Near steady temperature in the mid 70s. Southeast Winds around 5 Mph.

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Jerseyville Temperature Statistics

July Temperature

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

  • Lowest 23 July, 2026

    62.1 °F

  • Average July

    80.4 °F

  • Highest 2 July, 2026

    97.6 °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

    69 °F
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