Jerseyville Weather Forecast

    • 65
    • 90

    Partly Sunny

    • 60
    • 83

    Slight Chance Rain Showers

    • 68
    • 84

    Mostly Sunny

    • 69
    • 93

    Chance Rain Showers

    • 68
    • 92

    Chance Thunderstorms

    • 63
    • 86

    Chance Rain Showers

Today 12 Sep Jersey

Patchy fog this morning. Mostly sunny. Highs around 90. West Winds around 5 Mph.

Tonight 12 Sep Jersey

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the mid 60s. North Winds around 5 Mph.

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Jerseyville Temperature Statistics

September Temperature

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

  • Lowest 8 September, 2026

    62.7 °F

  • Average September

    82.4 °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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