Jerseyville Weather Forecast

    • 72
    • 92

    Chance Thunderstorms

    • 70
    • 89

    Chance Rain Showers

    • 75
    • 93

    Mostly Sunny

    • 67
    • 94

    Mostly Sunny

    • 61
    • 84

    Partly Sunny

    • 63
    • 83

    Partly Sunny

Today 18 Jul Jersey

Sunny with Highs in the lower 90s. West Winds 5 to 10 Mph with Gusts up to 20 Mph. Heat index Values up to 103.

Tonight 18 Jul Jersey

Partly cloudy. A chance of Showers and Thunderstorms, mainly in the evening. Humid with Lows in the lower 70s. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of rain 50 percent. Heat index Values up to 100 early in the evening.

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Jerseyville Temperature Statistics

July Temperature

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

  • Lowest 13 July, 2026

    66 °F

  • Average July

    80.8 °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

    68.9 °F
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