Jerseyville Weather Forecast

    • 64
    • 89

    Rain Showers Likely

    • 58
    • 72

    Rain Showers Likely

    • 51
    • 71

    Mostly Cloudy

    • 51
    • 73

    Partly Sunny

    • 54
    • 74

    Mostly Cloudy

    • 55
    • 76

    Partly Sunny

Today 20 Sep Jersey

Mostly cloudy late this Morning, then becoming partly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. Northwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 20 Sep Jersey

Mostly cloudy with a chance of Showers and Thunderstorms. Lows in the lower 60s. North Winds 5 to 10 Mph. Chance of rain 50 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 14 September, 2026

    60.7 °F

  • Average September

    81.5 °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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