Jamestown Weather Forecast

    • 72
    • 96

    Partly Sunny

    • 65
    • 93

    Chance Rain Showers

    • 59
    • 80

    Chance Thunderstorms

    • 53
    • 71

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 56
    • 76

    Partly Sunny

Today 19 Sep Clinton

Mostly sunny. Hot with Highs in the upper 90s. Southwest Winds around 5 Mph.

Tonight 19 Sep Clinton

Partly cloudy. Lows in the lower 70s. South Winds around 5 Mph.

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Jamestown Temperature Statistics

September Temperature

Belleville, Scott AFB/MidAmerica Airport (21.7 miles)

  • Lowest 8 September, 2026

    60.1 °F

  • Average September

    80.9 °F

  • Highest 5 September, 2026

    101.8 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (21.7 miles)

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  • Average Low 2021–2026

    48 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.2 °F
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