Jerseyville Weather Forecast

    • 69
    • 99

    Hot

    • 62
    • 89

    Mostly Sunny

    • 63
    • 88

    Mostly Sunny

    • 73
    • 95

    Mostly Sunny

    • 68
    • 98

    Slight Chance Thunderstorms

    • 64
    • 88

    Slight Chance Thunderstorms

Today 5 Sep Jersey

Sunny, hot with Highs in the upper 90s. Northwest Winds around 5 Mph. Heat index Values up to 108.

Tonight 5 Sep Jersey

Partly cloudy. Lows in the upper 60s. Northeast Winds around 5 Mph. Heat index Values up to 104 early in the evening.

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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

    85.8 °F

  • Highest 1 September, 2026

    100.7 °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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