Jerseyville Weather Forecast

    • 62
    • 90

    Decreasing Clouds

    • 61
    • 86

    Mostly Sunny

    • 72
    • 93

    Mostly Sunny

    • 67
    • 96

    Chance Thunderstorms

    • 61
    • 83

    Slight Chance Rain Showers

    • 62
    • 85

    Chance Rain Showers

Today 6 Sep Jersey

Partly sunny this Morning, then clearing. Not as warm with Highs in the upper 80s. Northeast Winds 5 to 10 Mph.

Tonight 6 Sep Jersey

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 60s. East Winds 5 to 10 Mph.

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Jerseyville Temperature Statistics

September Temperature

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

  • Lowest 1 September, 2026

    69.7 °F

  • Average September

    86.3 °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

    47.3 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    69 °F
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