Jerseyville Weather Forecast

    • 56
    • 70

    Mostly Cloudy

    • 54
    • 76

    Partly Sunny

    • 56
    • 77

    Mostly Sunny

    • 64
    • 81

    Rain Showers Likely

    • 65
    • 77

    Rain Showers Likely

    • 61
    • 78

    Chance Rain Showers

Today 26 Sep Jersey

Mostly cloudy. A chance of Sprinkles this Morning, then a slight chance of Showers this afternoon. Highs around 70. East Winds around 5 Mph. Chance of rain 20 percent.

Tonight 26 Sep Jersey

Mostly cloudy. A slight chance of Showers after midnight. Lows in the upper 50s. East Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Jerseyville Temperature Statistics

September Temperature

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

  • Lowest 23 September, 2026

    56.6 °F

  • Average September

    79.1 °F

  • Highest 2 September, 2026

    101.6 °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

    58.1 °F

  • Average High 2021–2026

    69 °F
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